Colloidal Synthesis of Air-Stable Alloyed CsSn1−xPbxI3 Perovskite Nanocrystals for Use in Solar Cells
Kentaro Kawabata a, Feng Liu a, Chao Ding a, Yaohong Zhang a, Qing Shen a, Shuzi Hayase a, Taro Toyoda a
a The University of Electro-Communications, Japan, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Poster, Kentaro Kawabata, 081
Publication date: 14th October 2019

Organic-inorganic hybrid perovskite solar cells have demonstrated
unprecedented high power conversion efficiencies in the past few years. Now, the
universal instability of the perovskites has become the main barrier for this kind of solar
cells to realize commercialization. This situation can be even worse for those tin-based
perovskites, especially for CsSnI3, because upon exposure to ambient atmosphere the
desired black orthorhombic phase CsSnI3 would promptly lose single crystallinity and
degrade to the inactive yellow phase, followed by irreversible oxidation into metallic
Cs2SnI6. By alloying CsSnI3 with CsPbI3, we herein report the synthesis of alloyed
perovskite quantum dot (QD), CsSn1-xPbxI3, which not only can be phase-stable for
months in purified colloidal solution but also remains intact even directly exposed to
ambient air, far superior to both of its parent CsSnI3 and CsPbI3 QDs. Ultrafast
transient absorption spectroscopy studies reveal that the photoexcited electrons in the
alloyed QDs can be injected into TiO2 nanocrystals at a fast rate of 1.12 × 1011 s-1,
which enables a high photocurrent generation in solar cells.

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