TiO2-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells

Weijun Ke; Constantinos C. Stoumpos; Jenna Leigh Logsdon; Michael R Wasielewski; Yanfa Yan; Guojia Fang; Mercouri G Kanatzidis

doi:10.1021/jacs.6b08790

TiO₂-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells

Weijun Ke, Constantinos C. Stoumpos, Jenna Leigh Logsdon, Michael R Wasielewski, Yanfa Yan, Guojia Fang, Mercouri G Kanatzidis

Northwestern University

Research output: Contribution to journal › Article

121 Citations (Scopus)

Abstract

Achieving high open-circuit voltage (V_oc) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the V_oc and photovoltaic performance of formamidinium tin iodide (FASnI₃) perovskite solar cells. The TiO₂-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI₃ perovskite solar cell using the cascaded TiO₂-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher V_oc of 0.380 V, a short-circuit current density of 23.09 mA cm^-2, and a fill factor of 60.01%. The cascade structure is further validated with a TiO₂-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher V_oc.

Original language	English
Pages (from-to)	14998-15003
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	138
Issue number	45
DOIs	https://doi.org/10.1021/jacs.6b08790
Publication status	Published - Nov 16 2016

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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Ke, W., Stoumpos, C. C., Logsdon, J. L., Wasielewski, M. R., Yan, Y., Fang, G., & Kanatzidis, M. G. (2016). TiO₂-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells. Journal of the American Chemical Society, 138(45), 14998-15003. https://doi.org/10.1021/jacs.6b08790

TiO₂-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells. / Ke, Weijun; Stoumpos, Constantinos C.; Logsdon, Jenna Leigh; Wasielewski, Michael R; Yan, Yanfa; Fang, Guojia; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 138, No. 45, 16.11.2016, p. 14998-15003.

Research output: Contribution to journal › Article

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abstract = "Achieving high open-circuit voltage (Voc) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the Voc and photovoltaic performance of formamidinium tin iodide (FASnI3) perovskite solar cells. The TiO2-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI3 perovskite solar cell using the cascaded TiO2-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher Voc of 0.380 V, a short-circuit current density of 23.09 mA cm-2, and a fill factor of 60.01%. The cascade structure is further validated with a TiO2-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher Voc.",

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AU - Yan, Yanfa

AU - Fang, Guojia

AU - Kanatzidis, Mercouri G

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