Photoinduced ion-redistribution in CH3NH3PbI3 perovskite solar cells
Photoinduced ion-redistribution in CH3NH3PbI3 perovskite solar cells
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CH3NH3PbI3 钙钛矿太阳能电池中的光诱导离子再分布
DOI：
10.1039/d0cp04350h
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发表时间：
2020
影响因子：
3.3
通讯作者：
Miyano Kenjiro
中科院分区：
文献类型：
--
作者：
Yanagida Masatoshi;Shirai Yasuhiro;Khadka Dhruba B.;Miyano Kenjiro
我们使用光诱导吸收光谱（PAS）研究了由氧化铟锡（ITO）/NiOx/钙钛矿/苯基-C61-丁酸甲酯（PCBM）/掺铝氧化锌（AZO）/ITO组成的CH 3 NH3 PbI 3钙钛矿太阳能电池中的离子运动。我们在调制的520 nm照明下观察到缓慢的（~ 50 mHz）光谱蓝移（~ 10−4 eV），我们根据体离子密度的调制解释了这一点。数值模拟表明，移动的离子在钙钛矿/电荷传输层界面处进出双层，以恢复由光生载流子倾斜的体电荷中性。当我们假设离子运动的特征时间常数由扩散决定时，离子的扩散系数为10−10至10−11 cm 2 s−1。
We use photoinduced absorption spectroscopy (PAS) to study the ionic motion in CH3NH3PbI3 perovskite solar cells, consisting of indium tin oxide (ITO)/NiOx/perovskite/phenyl-C61-butyric-acid–methyl ester (PCBM)/aluminum-doped zinc oxide (AZO)/ITO. We observed a slow (∼50 mHz) spectral blue shift (∼10−4 eV) under modulated 520 nm illumination, which we interpreted in terms of the modulation in the bulk ion density. Numerical simulation shows that the mobile ion moves in and out from the double layers at the perovskite/charge transport layer interfaces in order to recover the bulk charge neutrality tipped off-balance by the photocarriers. The diffusion coefficient of the ion is 10−10 to 10−11 cm2 s−1, when we assume that the characteristic time constant of the ion motion is governed by the diffusion.