Piezo-phototronic Effect Enhanced Photodetector Based on CH₃NH₃PbI₃ Single Crystals

Abstract

Piezoelectric organic–inorganic lead halide perovskites have recently attracted much attention in the field of optoelectronic devices. However, their piezoelectric properties as a possible way to modulate device performances have rarely been reported. Here, we study experimentally a photodetector based on CH3NH3PbI3(MAPbI3) single crystals, whose performance is effectively modulated via an emerging effectthe piezo-phototronic effect, which is to use the piezoelectric polarization charges to tune the optoelectronic processes at the interface. A piezoelectric coefficient of 10.81 pm/V of the CH3NH3PbI3 single crystal is obtained. Under 680 nm laser illumination with a power density of 3.641 mW/cm2 and at an external bias of 2 V, compared to the case without straining, the light current of the photodetector is enhanced by ∼120% when a 43.48 kPa compressive pressure is applied. The response speed of the photocurrent is 3 and 2 times faster than the cases without applying pressure for the light-on and light-off states, respectively. This work proves that the performance of the photodetector based on MAPbI3 single crystals can be effectively enhanced by the piezo-phototronic effect, providing a good method for optimizing the performance of future perovskite-based optoelectronic devices.

Quantum Dots for Hybrid Energy Harvesting: From Integration to Piezo‐Phototronics

“…Second, organic‐inorganic hybrid metal halide perovskites have also attracted tremendous interests due to their superior material properties for optoelectronic applications, such as large absorption coefficient, long charge carrier lifetime and diffusion length . The piezo‐phototronic effect in the organic‐inorganic hybrid metal halide perovskites has also demonstrated using a photodetector in 2018, which suggests that the halide perovskites are promising materials for piezo‐phototronic applications in the future …”

“…These fields are experiencing unprecedentedly fast progress in recent years. [22][23][24][25] In this review paper, we introduce recent progress in the field of hybrid energy harvesting, largely focusing on the solar cell and mechanical energy harvester. First, a basic theory and mechanism of each device is explained, and then we expand our focus to an integrated energy harvester.…”

On the Piezo‐Phototronic Effect in Si/ZnO Heterojunction Photodiode: The Effect of the Fermi‐Level Difference

“…Recently, the piezo‐phototronic effect was extensively utilized to enhance the performances of advanced optoelectronic devices such as photodiodes (PDs), [ 1–12 ] solar cells, [ 13–18 ] and light‐emitting diodes. [ 19–25 ] The basic principle of the piezo‐phototronic effect is the external strain‐induced energy band structure modulation at the local interface of a p‐n junction or a Schottky junction.…”

Flexible Difunctional (Pressure and Light) Sensors Based on ZnO Nanowires/Graphene Heterostructures

“…The three‐way coupling among piezoelectric, semiconductor, and photoexcitation properties casts two promising fields: piezotronics and piezo‐phototronics, which have been substantially discovered and investigated in the third‐generation semiconductors, transition‐metal dichalcogenides, and perovskites . As the third‐generation semiconductors, such as ZnO, CdS, GaN, etc., are generally non‐centrosymmetrical crystal structures, hence piezoelectricity and piezotronic effect are the born characteristics of these semiconductors.…”