TY - JOUR
T1 - Air-stable molecular semiconducting iodosalts for solar cell applications
T2 - Cs2SnI6 as a hole conductor
AU - Lee, Byunghong
AU - Stoumpos, Constantinos C.
AU - Zhou, Nanjia
AU - Hao, Feng
AU - Malliakas, Christos
AU - Yeh, Chen Yu
AU - Marks, Tobin J.
AU - Kanatzidis, Mercouri G.
AU - Chang, Robert P.H.
N1 - Publisher Copyright:
© 2014 American Chemical Society.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/10/29
Y1 - 2014/10/29
N2 - We introduce a new class of molecular iodosalt compounds for application in next-generation solar cells. Unlike tin-based perovskite compounds CsSnI3 and CH3NH3SnI3, which have Sn in the 2+ oxidation state and must be handled in an inert atmosphere when fabricating solar cells, the Sn in the molecular iodosalt compounds is in the 4+ oxidation state, making them stable in air and moisture. As an example, we demonstrate that, using Cs2SnI6 as a hole transporter, we can successfully fabricate in air a solid-state dye-sensitized solar cell (DSSC) with a mesoporous TiO2 film. Doping Cs2SnI6 with additives helps to reduce the internal device resistance, improving cell efficiency. In this way, a Z907 DSSC delivers 4.7% of energy conversion efficiency. By using a more efficient mixture of porphyrin dyes, an efficiency near 8% with photon confinement has been achieved. This represents a significant step toward the realization of low-cost, stable, lead-free, and environmentally benign next-generation solid-state solar cells.
AB - We introduce a new class of molecular iodosalt compounds for application in next-generation solar cells. Unlike tin-based perovskite compounds CsSnI3 and CH3NH3SnI3, which have Sn in the 2+ oxidation state and must be handled in an inert atmosphere when fabricating solar cells, the Sn in the molecular iodosalt compounds is in the 4+ oxidation state, making them stable in air and moisture. As an example, we demonstrate that, using Cs2SnI6 as a hole transporter, we can successfully fabricate in air a solid-state dye-sensitized solar cell (DSSC) with a mesoporous TiO2 film. Doping Cs2SnI6 with additives helps to reduce the internal device resistance, improving cell efficiency. In this way, a Z907 DSSC delivers 4.7% of energy conversion efficiency. By using a more efficient mixture of porphyrin dyes, an efficiency near 8% with photon confinement has been achieved. This represents a significant step toward the realization of low-cost, stable, lead-free, and environmentally benign next-generation solid-state solar cells.
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U2 - 10.1021/ja508464w
DO - 10.1021/ja508464w
M3 - Article
AN - SCOPUS:84908632240
VL - 136
SP - 15379
EP - 15385
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 43
ER -