标题： 有机金属卤化物钙钛矿CH$_3$NH$_3$PbI$_3$中的圆偏振光电效应 显示英文标题

标题： Circular Photogalvanic Effect in Organometal Halide Perovskite CH$_3$NH$_3$PbI$_3$

摘要： 我们研究了有机金属卤化物钙钛矿太阳能电池吸收层CH$_3$NH$_3$PbI$_3$中的圆偏振光电效应。对于缺乏倒置对称性的晶体结构，计算得到的光电流密度约为$10^{-9}$A/W，与之前研究的量子阱和体 Rashba 系统相当。由于圆偏振光电效应依赖于倒置对称性的破坏，可以通过调节光子能量和相应的穿透深度来探测从表面不同深度处的倒置不对称程度。我们提出，对此效应的测量可能澄清该材料是否存在倒置对称性，这是一个有争议的问题，并被认为在该材料的高转换效率中起着重要作用。 显示英文摘要

摘要： We study the circular photogalvanic effect in the organometal halide perovskite solar cell absorber CH$_3$NH$_3$PbI$_3$. For crystal structures which lack inversion symmetry, the calculated photocurrent density is about $10^{-9}$ A/W, comparable to the previously studied quantum well and bulk Rashba systems. Because of the dependence of the circular photogalvanic effect on inversion symmetry breaking, the degree of inversion asymmetry at different depths from the surface can be probed by tuning the photon energy and associated penetration depth. We propose that measurements of this effect may clarify the presence or absence of inversion symmetry, which remains a controversial issue and has been argued to play an important role in the high conversion efficiency of this material.