用于增强钙钛矿太阳能电池在空气中性能的混合锡锗钙钛矿。
Mixed Sn-Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air.
作者信息
Ito Nozomi, Kamarudin Muhammad Akmal, Hirotani Daisuke, Zhang Yaohong, Shen Qing, Ogomi Yuhei, Iikubo Satoshi, Minemoto Takashi, Yoshino Kenji, Hayase Shuzi
机构信息
Graduate School of Life Science and Systems Engineering , Kyushu Institute of Technology , 2-4 Hibikino , Wakamatsu-ku, Kitakyushu-shi , Fukuoka-ken 808-0196 , Japan.
Faculty of Informatics and Engineering , The University of Electro-Communications , 1-5-1 Chofugaoka , Chofu , Tokyo 182-8585 , Japan.
出版信息
J Phys Chem Lett. 2018 Apr 5;9(7):1682-1688. doi: 10.1021/acs.jpclett.8b00275. Epub 2018 Mar 20.
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.
近年来，铅基钙钛矿太阳能电池取得了进展，其效率高达20%，与硅太阳能电池相当。然而，铅的毒性使其成为太阳能电池应用的不理想候选材料。相比之下，锡基钙钛矿因其无毒性质和丰富储量而被提出。不幸的是，这些太阳能电池存在效率低和稳定性差的问题。在此，我们提出一种基于锡和锗混合的新型钙钛矿材料。通过光声光谱测量，该材料的带隙约为1.4 - 1.5 eV，从太阳能电池的角度来看这是理想的。在具有倒置平面结构的太阳能电池器件中，纯锡钙钛矿太阳能电池的效率为中等的3.31%。当在空气中无封装条件下测量时，向钙钛矿中掺入5%的锗后，效率提高到4.48%（72小时后为6.90%）。
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