This study examines the photocurrent (photoconductivity) spectra of thick methylammonium lead iodide perovskite layers coupled to symmetric metal electrodes. A large photocurrent peak has been observed in the near-band-gap wavelength region. The origin of this current peak is related to an interplay between the penetration depths of light having a certain wavelength and its ability to raise the concentration of the charge carriers. A model including the generation, position-specific or uniform recombination, as well as diffusion of charge carrier pairs, made it possible to reproduce the experimental findings. Besides the microscopic approach, we also present a phenomenological model and a simulation providing the conductance for an arbitrary relative orientation of the illuminating beam and the field imposed by the electrodes. The results enabled us to outline the functioning principle of a sensor for determining the angle of incidence of electromagnetic radiation. Furthermore, a method for estimating optical absorption spectra from photocurrent spectra is delineated.

中文翻译：

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具有对称金属电极的厚甲基碘化铅碘化物光电传感器中的大带边光电流峰值

这项研究检查了耦合到对称金属电极上的厚甲基碘化碘化铅钙钛矿层的光电流（光电导）光谱。在近带隙波长区域中观察到大的光电流峰值。该电流峰值的起源与具有特定波长的光的穿透深度与其提高电荷载流子浓度的能力之间的相互作用有关。包括生成，位置特异性或均匀重组以及电荷载流子对扩散的模型，可以重现实验结果。除了微观方法外，我们还提供了现象学模型和模拟，为照明光束的任意相对方向和电极施加的电场提供了电导。结果使我们能够概述确定电磁辐射入射角的传感器的工作原理。此外，描述了一种用于从光电流谱估计光学吸收谱的方法。