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  1. Article: Electrochemical Impedance Spectroscopy of All-Perovskite Tandem Solar Cells.

    Roose, Bart / Dey, Krishanu / Fitzsimmons, Melissa R / Chiang, Yu-Hsien / Cameron, Petra J / Stranks, Samuel D

    ACS energy letters

    2024  Volume 9, Issue 2, Page(s) 442–453

    Abstract: This work explores electrochemical impedance spectroscopy to study recombination and ionic processes in all-perovskite tandem solar cells. We exploit selective excitation of each subcell to enhance or suppress the impedance signal from each subcell, ... ...

    Abstract This work explores electrochemical impedance spectroscopy to study recombination and ionic processes in all-perovskite tandem solar cells. We exploit selective excitation of each subcell to enhance or suppress the impedance signal from each subcell, allowing study of individual tandem subcells. We use this selective excitation methodology to show that the recombination resistance and ionic time constants of the wide gap subcell are increased with passivation. Furthermore, we investigate subcell-dependent degradation during maximum power point tracking and find an increase in recombination resistance and a decrease in capacitance for both subcells. Complementary optical and external quantum efficiency measurements indicate that the main driver for performance loss is the reduced capacity of the recombination layer to facilitate recombination due to the formation of a charge extraction barrier. This methodology highlights electrochemical impedance spectroscopy as a powerful tool to provide critical feedback to unlock the full potential of perovskite tandem solar cells.
    Language English
    Publishing date 2024-01-11
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.3c02018
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Health outcomes associated with participating in community care centres for older people in Taiwan.

    Chiang, Yu-Hsien / Hsu, Hui-Chuan

    Health & social care in the community

    2018  Volume 27, Issue 2, Page(s) 337–347

    Abstract: Community care centres (CCCs) are widespread across Taiwan and have provided health promotion and social activities for older people in communities since 1995. The purpose of this study was to describe the status of the delivery and management of CCCs ... ...

    Abstract Community care centres (CCCs) are widespread across Taiwan and have provided health promotion and social activities for older people in communities since 1995. The purpose of this study was to describe the status of the delivery and management of CCCs for older people, and to explore the effects of individual factors and the organisational factors on the health-related outcome of older people's participation in CCCs. The sample was taken from participants at CCCs in Taichung, Taiwan. Twenty-five CCCs participated in the study. The managers and the elderly participants of CCCs underwent face-to-face interviews. In total, 417 elderly participants and 25 chiefs completed the face-to-face interviews. The participants reported that self-reported health, sleep quality, memory, family relationships, care for health, and health literacy improved after they participated in the programme. There were no consistent organisational factors related to the outcomes. However, management style was related to sleep quality improvement and staffing getting paid was related to family relationship improvement. Policy recommendations are provided.
    MeSH term(s) Aged ; Aged, 80 and over ; Community Health Centers/organization & administration ; Female ; Health Promotion ; Health Status ; Humans ; Interviews as Topic ; Logistic Models ; Male ; Outcome Assessment, Health Care ; Qualitative Research ; Self Report ; Social Capital ; Taiwan
    Language English
    Publishing date 2018-09-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 1155902-0
    ISSN 1365-2524 ; 0966-0410
    ISSN (online) 1365-2524
    ISSN 0966-0410
    DOI 10.1111/hsc.12651
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  3. Article: Multisource Vacuum Deposition of Methylammonium-Free Perovskite Solar Cells.

    Chiang, Yu-Hsien / Anaya, Miguel / Stranks, Samuel D

    ACS energy letters

    2020  Volume 5, Issue 8, Page(s) 2498–2504

    Abstract: Halide perovskites of the form ... ...

    Abstract Halide perovskites of the form ABX
    Keywords covid19
    Language English
    Publishing date 2020-06-25
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.0c00839
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  4. Article ; Online: Methylammonium-free co-evaporated perovskite absorbers with high radiation and UV tolerance: an option for in-space manufacturing of space-PV?

    Lang, Felix / Chiang, Yu-Hsien / Frohna, Kyle / Ozen, Sercan / Neitzert, Heinz C / Denker, Andrea / Stolterfoht, Martin / Stranks, Samuel D

    RSC advances

    2023  Volume 13, Issue 31, Page(s) 21138–21145

    Abstract: With a remarkable tolerance to high-energetic radiation and potential high power-to-weight ratios, halide perovskite-based solar cells are interesting for future space PV applications. In this work, we fabricate and test methylammonium-free, co- ... ...

    Abstract With a remarkable tolerance to high-energetic radiation and potential high power-to-weight ratios, halide perovskite-based solar cells are interesting for future space PV applications. In this work, we fabricate and test methylammonium-free, co-evaporated FA
    Language English
    Publishing date 2023-07-12
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d3ra03846g
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  5. Article: Vacuum-Deposited Wide-Bandgap Perovskite for All-Perovskite Tandem Solar Cells.

    Chiang, Yu-Hsien / Frohna, Kyle / Salway, Hayden / Abfalterer, Anna / Pan, Linfeng / Roose, Bart / Anaya, Miguel / Stranks, Samuel D

    ACS energy letters

    2023  Volume 8, Issue 6, Page(s) 2728–2737

    Abstract: All-perovskite tandem solar cells beckon as lower cost alternatives to conventional single-junction cells. Solution processing has enabled rapid optimization of perovskite solar technologies, but new deposition routes will enable modularity and ... ...

    Abstract All-perovskite tandem solar cells beckon as lower cost alternatives to conventional single-junction cells. Solution processing has enabled rapid optimization of perovskite solar technologies, but new deposition routes will enable modularity and scalability, facilitating technology adoption. Here, we utilize 4-source vacuum deposition to deposit FA
    Language English
    Publishing date 2023-05-24
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.3c00564
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Halide Remixing under Device Operation Imparts Stability on Mixed-Cation Mixed-Halide Perovskite Solar Cells.

    Ruggeri, Edoardo / Anaya, Miguel / Gałkowski, Krzysztof / Abfalterer, Anna / Chiang, Yu-Hsien / Ji, Kangyu / Andaji-Garmaroudi, Zahra / Stranks, Samuel D

    Advanced materials (Deerfield Beach, Fla.)

    2022  Volume 34, Issue 36, Page(s) e2202163

    Abstract: Mixed-halide mixed-cation hybrid perovskites are among the most promising perovskite compositions for application in a variety of optoelectronic devices due to their high performance, low cost, and bandgap-tuning capabilities. Instability pathways such ... ...

    Abstract Mixed-halide mixed-cation hybrid perovskites are among the most promising perovskite compositions for application in a variety of optoelectronic devices due to their high performance, low cost, and bandgap-tuning capabilities. Instability pathways such as those driven by ionic migration, however, continue to hinder their further progress. Here, an operando variable-pitch synchrotron grazing-incidence wide-angle X-ray scattering technique is used to track the surface and bulk structural changes in mixed-halide mixed-cation perovskite solar cells under continuous load and illumination. By monitoring the evolution of the material structure, it is demonstrated that halide remixing along the electric field and illumination direction during operation hinders phase segregation and limits device instability. Correlating the evolution with directionality- and depth-dependent analyses, it is proposed that this halide remixing is induced by an electrostrictive effect acting along the substrate out-of-plane direction. However, this stabilizing effect is overwhelmed by competing halide demixing processes in devices exposed to humid air or with poorer starting performance. The findings shed new light on understanding halide de- and re-mixing competitions and their impact on device longevity. These operando techniques allow real-time tracking of the structural evolution in full optoelectronic devices and unveil otherwise inaccessible insights into rapid structural evolution under external stress conditions.
    Language English
    Publishing date 2022-08-07
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202202163
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  7. Article: The Electronic Disorder Landscape of Mixed Halide Perovskites.

    Liu, Yun / Banon, Jean-Philippe / Frohna, Kyle / Chiang, Yu-Hsien / Tumen-Ulzii, Ganbaatar / Stranks, Samuel D / Filoche, Marcel / Friend, Richard H

    ACS energy letters

    2022  Volume 8, Issue 1, Page(s) 250–258

    Abstract: Band gap tunability of lead mixed halide perovskites makes them promising candidates for various applications in optoelectronics. Here we use the localization landscape theory to reveal that the static disorder due to iodide:bromide compositional ... ...

    Abstract Band gap tunability of lead mixed halide perovskites makes them promising candidates for various applications in optoelectronics. Here we use the localization landscape theory to reveal that the static disorder due to iodide:bromide compositional alloying contributes at most 3 meV to the Urbach energy. Our modeling reveals that the reason for this small contribution is due to the small effective masses in perovskites, resulting in a natural length scale of around 20 nm for the "effective confining potential" for electrons and holes, with short-range potential fluctuations smoothed out. The increase in Urbach energy across the compositional range agrees well with our optical absorption measurements. We model systems of sizes up to 80 nm in three dimensions, allowing us to accurately reproduce the experimentally observed absorption spectra of perovskites with halide segregation. Our results suggest that we should look beyond static contribution and focus on the dynamic temperature dependent contribution to the Urbach energy.
    Language English
    Publishing date 2022-11-30
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.2c02352
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  8. Article: Multisource Vacuum Deposition of Methylammonium-Free Perovskite Solar Cells

    Chiang, Yu-Hsien / Anaya, Miguel / Stranks, Samuel D

    ACS Energy Lett

    Abstract: Halide perovskites of the form ABX3 have shown outstanding properties for solar cells. The highest reported compositions consist of mixtures of A-site cations methylammonium (MA), formamidinium (FA) and cesium, and X-site iodide and bromide ions, and are ...

    Abstract Halide perovskites of the form ABX3 have shown outstanding properties for solar cells. The highest reported compositions consist of mixtures of A-site cations methylammonium (MA), formamidinium (FA) and cesium, and X-site iodide and bromide ions, and are produced by solution processing. However, it is unclear whether solution processing will yield sufficient spatial performance uniformity for large-scale photovoltaic modules or compatibility with deposition of multilayered tandem solar cell stacks. In addition, the volatile MA cation presents long-term stability issues. Here, we report the multisource vacuum deposition of FA0.7Cs0.3Pb(I0.9Br0.1)3 perovskite thin films with high-quality morphological, structural, and optoelectronic properties. We find that the controlled addition of excess PbI2 during the deposition is critical for achieving high performance and stability of the absorber material, and we fabricate p-i-n solar cells with stabilized power output of 18.2%. We also reveal the sensitivity of the deposition process to a range of parameters, including substrate, annealing temperature, evaporation rates, and source purity, providing a guide for further evaporation efforts. Our results demonstrate the enormous promise for MA-free perovskite solar cells employing industry-scalable multisource evaporation processes.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #32832697
    Database COVID19

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  9. Article ; Online: Critical Assessment of the Use of Excess Lead Iodide in Lead Halide Perovskite Solar Cells.

    Roose, Bart / Dey, Krishanu / Chiang, Yu-Hsien / Friend, Richard H / Stranks, Samuel D

    The journal of physical chemistry letters

    2020  Volume 11, Issue 16, Page(s) 6505–6512

    Abstract: It is common practice in the lead halide perovskite solar cell field to add a small molar excess of lead iodide ( ... ...

    Abstract It is common practice in the lead halide perovskite solar cell field to add a small molar excess of lead iodide (PbI
    Language English
    Publishing date 2020-07-30
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.0c01820
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  10. Book ; Online: The electronic disorder landscape of mixed halide perovskites

    Liu, Yun / Banon, Jean-Philippe / Frohna, Kyle / Chiang, Yu-Hsien / Tumen-Ulzii, Ganbaatar / Stranks, Samuel D. / Filoche, Marcel / Friend, Richard H.

    2022  

    Abstract: Bandgap tunability of lead mixed-halide perovskites makes them promising candidates for various applications in optoelectronics since they exhibit sharp optical absorption onsets despite the presence of disorder from halide alloying. Here we use ... ...

    Abstract Bandgap tunability of lead mixed-halide perovskites makes them promising candidates for various applications in optoelectronics since they exhibit sharp optical absorption onsets despite the presence of disorder from halide alloying. Here we use localization landscape theory to reveal that the static disorder due to compositional alloying for iodide:bromide perovskite contributes at most 3 meV to the Urbach energy. Our modelling reveals that the reason for this small contribution is due to the small effective masses in perovskites, resulting in a natural length scale of around 20nm for the "effective confining potential" for electrons and holes, with short range potential fluctuations smoothed out. The increase in Urbach energy across the compositional range agrees well with our optical absorption measurements. We model systems of sizes up to 80 nm in three dimensions, allowing us to explore halide segregation, accurately reproducing the experimentally observed absorption spectra and demonstrating the scope of our method to model electronic structures on large length scales. Our results suggest that we should look beyond static contribution and focus on the dynamic temperature dependent contribution to the Urbach energy.

    Comment: 4 figures
    Keywords Condensed Matter - Materials Science ; Condensed Matter - Disordered Systems and Neural Networks
    Subject code 530
    Publishing date 2022-10-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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