Bao Jin#, Nian Zuo#, Zhi-Yi Hu#, Wenjun Cui, Renyan Wang, Gustaaf Van Tendeloo, Xing Zhou*, Tianyou Zhai*, Excellent Excitonic Photovoltaic Effect in 2D CsPbBr3/CdS Heterostructures, Advanced Functional Materials 2020, 30, 2006166.
https://doi.org/10.1002/adfm.202006166.
Abstract: P-n photovoltaic junctions are essential building blocks for optoelectronic function devices for energy conversion. However, this photovoltaic efficiency almost reached its theoretical limit in the dramatically development. Here, we reveal a brand-new excitonic photovoltaic effect in 2D CsPbBr3/CdS heterostructures. These heterostructures, synthesized by epitaxial growth, display a clean interface and a strong interlayer coupling. The excitonic photovoltaic effect is a function of both the built-in equilibrium electrical potential energy and the chemical potential energy, which is generated by the significant concentration gradient for electrons and holes at the heterojunction interface. Excitingly, this novel photovoltaic effect results in a large open-circuit voltage of 0.76 V and a high power conversion efficiency of 17.5%. In addition, high photodetection performances, including a high photoswitch ratio (Ilight/Idark) of 105 and a fast response rate of 23 μs are obtained. These findings provide a new platform for photovoltaic applications.
