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

Nozomi Ito, Muhammad Akmal Kamarudin, Daisuke Hirotani, Yaohong Zhang, Qing Shen, Yuhei Ogomi, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

Research output: Contribution to journalArticlepeer-review

200 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1682-1688
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number7
Publication statusPublished - Apr 5 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry


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