A high performance CsPbBr₃ microwire based photodetector boosted by coupling plasmonic and piezo-phototronic effects

Lead halide perovskites have attracted much attention in photodetector fabrication. Up to now, several strategies have been used to modulate the device performance. Here, P3HT-CsPbBr₃ monocrystalline microwires based photodetectors are demonstrated by coupling LSPR and piezo-phototronic effects. The photocurrent, response speed and recovery speed under 532 nm laser illumination were increased to nearly 3.5, 70 and 8.4 times when decorated with Au NCs and applied with a compressive strain of −0.29%, respectively. The enhancement of performances can be attributed to the increased light absorption caused by LSPR effect and the enhanced separation of photo-generated holes at the heterojunction interface caused by piezo-phototronic effect. This work suggests that all-inorganic perovskites CsPbBr₃ based photodetectors can be significantly enhanced by coupling plasmonic and piezo-phototronic effects. This strategy can be used to modulate the performance of optoelectronic devices based on other piezoelectric materials.