Mixed Sn–Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air

Lead-based perovskite solar cells have gained ground in recent years, showing efficiency as high as 20%, which is on par with that of silicon solar cells. However, the toxicity of lead makes it a nonideal candidate for use in solar cells. Alternatively, tin-based perovskites have been proposed becau...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2018-04, Vol.9 (7), p.1682-1688
Main Authors: Ito, Nozomi, Kamarudin, Muhammad Akmal, Hirotani, Daisuke, Zhang, Yaohong, Shen, Qing, Ogomi, Yuhei, Iikubo, Satoshi, Minemoto, Takashi, Yoshino, Kenji, Hayase, Shuzi
Format: Article
Language:English
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Summary:Lead-based perovskite solar cells have gained ground in recent years, showing efficiency as high as 20%, which is on par with that of silicon solar cells. However, the toxicity of lead makes it a nonideal candidate for use in solar cells. Alternatively, tin-based perovskites have been proposed because of their nontoxic nature and abundance. Unfortunately, these solar cells suffer from low efficiency and stability. Here, we propose a new type of perovskite material based on mixed tin and germanium. The material showed a band gap around 1.4–1.5 eV as measured from photoacoustic spectroscopy, which is ideal from the perspective of solar cells. In a solar cell device with inverted planar structure, pure tin perovskite solar cell showed a moderate efficiency of 3.31%. With 5% doping of germanium into the perovskite, the efficiency improved up to 4.48% (6.90% after 72 h) when measured in air without encapsulation.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.8b00275