Utilizing Angle-Dependent Photovoltage Effect in a CH3NH3PbCl3/Si Heterojunction toward High-Performance Polarized Light Detection in Ultraviolet Region

Organic–inorganic hybrid MAPbCl 3 perovskite (MA + = CH 3 NH 3 + ) in UV photodetection is drawing interest due to its superior semiconductor properties and UV-matchable optical bandgap. However, MAPbCl 3 -based photodetector targeting high-performance polarized light detection has remained unexplored due to the isotropic structure of MAPbCl 3 . The photovoltaic effect in the heterojunction, which shows an angle dependence on light polarization, provides opportunities to break the restriction of intrinsic structure for realizing polarization-sensitive photodetection. Herein, an effective strategy is reported to realize high-performance polarization-sensitive UV photodetection by constructing a heterojunction with two isotropic materials MAPbCl 3 and Silicon (Si). Emphatically, the photovoltage in MAPbCl 3 /Si heterojunction changes with the angle of polarized light with the maximum (minimum) value of 0.15 V (0.05 V), originating from the built-in electric field. More interestingly, driven by the photovoltage, the device thus exhibits a large polarization ratio ( I max / I min ) of 2.9 at 377 nm under the self-driven mode. Besides, the present device also delivers high-performance photodetection in UV region owing to the superior photoresponse of MAPbCl 3 , including a high detectivity ( D* ) of 2.93 × 10 11 Jones, a superior responsibility of 8 mA W –1 , a substantial switching ratio of 900, and an ultrafast response speed of 40/98 µs at 0 V bias. This work opens a new avenue for high-performance polarization-sensitive photodetection by utilizing angle-dependent photovoltage effect.