TY - JOUR
T1 - Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI3
AU - Ke, Weijun
AU - Stoumpos, Constantinos C.
AU - Zhu, Menghua
AU - Mao, Lingling
AU - Spanopoulos, Ioannis
AU - Liu, Jian
AU - Kontsevoi, Oleg Y.
AU - Chen, Michelle
AU - Sarma, Debajit
AU - Zhang, Yongbo
AU - Wasielewski, Michael R.
AU - Kanatzidis, Mercouri G.
N1 - Publisher Copyright:
© Copyright 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
PY - 2017/8
Y1 - 2017/8
N2 - 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 threedimensional ASnI3 structure is stable only with methylammonium, FA, and Cs cations, and the bandgap can be tuned with solid solutions, such as ASnI3-xBrx. 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.
AB - 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 threedimensional ASnI3 structure is stable only with methylammonium, FA, and Cs cations, and the bandgap can be tuned with solid solutions, such as ASnI3-xBrx. 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.
UR - http://www.scopus.com/inward/record.url?scp=85031744705&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85031744705&partnerID=8YFLogxK
U2 - 10.1126/sciadv.1701293
DO - 10.1126/sciadv.1701293
M3 - Article
C2 - 28875173
AN - SCOPUS:85031744705
VL - 3
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 8
M1 - e1701293
ER -