Piezo-phototronic Effect Enhanced Photodetector Based on CH3NH3PbI3 Single Crystals

Qingsong Lai; Laipan Zhu; Yaokun Pang; Liang Xu; Jian Chen; Zewei Ren; Jianjun Luo; Longfei Wang; Libo Chen; Kai Han; Pei Lin; Ding Li; Shiquan Lin; Baodong Chen; Caofeng Pan; Zhong Lin Wang

doi:10.1021/acsnano.8b06243

Piezo-phototronic Effect Enhanced Photodetector Based on CH₃NH₃PbI₃ Single Crystals

ACS Nano. 2018 Oct 23;12(10):10501-10508. doi: 10.1021/acsnano.8b06243. Epub 2018 Oct 4.

Authors

Qingsong Lai^{1

2}, Laipan Zhu^{1

2}, Yaokun Pang^{1

2}, Liang Xu^{1

2}, Jian Chen^{1

2}, Zewei Ren^{1

2}, Jianjun Luo^{1

2}, Longfei Wang^{1

2}, Libo Chen^{1

2}, Kai Han^{1

2}, Pei Lin^{1

2}, Ding Li^{1

2}, Shiquan Lin^{1

2}, Baodong Chen^{1

2}, Caofeng Pan^{1

2

3}, Zhong Lin Wang^{1

2

4

3}

Affiliations

¹ CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems , Chinese Academy of Sciences , Beijing 100083 , P.R. China.
² School of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , P.R. China.
³ Center on Nanoenergy Research, School of Physical Science and Technology , Guangxi University , Nanning 530004 , P.R. China.
⁴ School of Material Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.

PMID: 30277745
DOI: 10.1021/acsnano.8b06243

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.

Keywords: perovskite-based single crystal; photodetectors; piezo-phototronic effect; piezoelectric charges; piezopotential.