@article{oai:kyutech.repo.nii.ac.jp:00005865,
 author = {Ito,  Nozomi and Kamarudin,  Muhammad Akmal and Hirotani,  Daisuke and Zhang,  Yaohong and Shen,  Qing and Ogomi,  Yuhei and オゴミ, ユウヘイ and Iikubo, Satoshi and 飯久保, 智 and Minemoto,  Takashi and Yoshino,  Kenji and Hayase, Shuzi and 早瀬, 修二},
 issue = {7},
 journal = {Journal of Physical Chemistry Letters},
 month = {Mar},
 note = {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.},
 pages = {1682--1688},
 title = {Mixed Sn–Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air},
 volume = {9},
 year = {2018},
 yomi = {尾込, 裕平 and イイクボ, サトシ and ハヤセ, シュウジ}
}