Proceedings of the National Academy of Sciences of the United States of America ( IF 9.4 ) Pub Date : 2018-09-18 , DOI: 10.1073/pnas.1805422115 Daniel Niesner 1 , Martin Hauck 2 , Shreetu Shrestha 3 , Ievgen Levchuk 3 , Gebhard J. Matt 3 , Andres Osvet 3 , Miroslaw Batentschuk 3 , Christoph Brabec 3, 4 , Heiko B. Weber 2 , Thomas Fauster 1
Lead halide perovskites are used in thin-film solar cells, which owe their high efficiency to the long lifetimes of photocarriers. Various calculations find that a dynamical Rashba effect could significantly contribute to these long lifetimes. This effect is predicted to cause a spin splitting of the electronic bands of inversion-symmetric crystalline materials at finite temperatures, resulting in a slightly indirect band gap. Direct experimental evidence of the existence or the strength of the spin splitting is lacking. Here, we resonantly excite photocurrents in single crystalline (
中文翻译:
结构上的波动会导致四方(CH3NH3)PbI3发生自旋分裂状态,这由圆形光电动效应证明。
钙钛矿卤化物用于薄膜太阳能电池中,这是由于它们的高效率归因于光载流子的长寿命。各种计算都发现,动态的Rashba效应可能会大大延长这些使用寿命。据预测,这种作用会在有限的温度下引起反转对称晶体材料电子带的自旋分裂,从而导致间接带隙的产生。缺乏自旋分裂的存在或强度的直接实验证据。在这里,我们共振激发单晶的光电流(