Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI3

Ke, Weijun; Stoumpos, Constantinos C.; Zhu, Menghua; Mao, Lingling; Spanopoulos, Ioannis; Liu, Jian; Kontsevoi, Oleg Y.; Chen, Michelle; Sarma, Debajit; Zhang, Yongbo; Wasielewski, Michael R.; Kanatzidis, Mercouri G.

doi:10.1126/sciadv.1701293

Title: Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI₃

Journal Article · Wed Aug 30 00:00:00 EDT 2017 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1701293· OSTI ID:1425891

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^[1]; Zhang, Yongbo ^[1];

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Northwestern Univ., Evanston, IL (United States)

Perovskite solar cells have revolutionized the fabrication of solution-processable solar cells. The presence of lead in the devices makes this technology less attractive, and alternative metals in perovskites are being researched as suitable alternatives. We demonstrate a new type of tin-based perovskite absorber that incorporates both ethylenediammonium (en) and formamidinium (FA), forming new materials of the type {en}FASnI₃. The three-dimensional ASnI₃ structure is stable only with methylammonium, FA, and Cs cations, and the bandgap can be tuned with solid solutions, such as ASnI_3-xBr_x. We show that en can serve as a new A cation capable of achieving marked increases in the bandgap without the need for solid solutions. The en introduces a new bandgap tuning mechanism that arises from massive Schottky style defects. In addition, incorporation of the en cation in the structure markedly increases the air stability and improves the photoelectric properties of the tin-based perovskite absorbers. Our best-performing {en}FASnI₃ solar cell has the highest efficiency of 7.14%, which is achieved for a lead-free perovskite cell, and retains 96% of its initial efficiency after aging over 1000 hours with encapsulation. Our results introduce a new approach for improving the performance and stability of tin-based, lead-free perovskite solar cells.

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Research Organization:: Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001059

OSTI ID:: 1425891

Journal Information:: Science Advances, Vol. 3, Issue 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 245 works

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Title: Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI3

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Title: Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI₃