MAPbI3 Photodetectors with 4.7 MHz Bandwidth and Their Application in Organic Optocouplers

Zhewei Li; Lixian Jiang; Xin Rong; Qingshun Dong; Huanli Dong; Liduo Wang; Guifang Dong

doi:10.1021/acs.jpclett.1c04137

MAPbI₃ Photodetectors with 4.7 MHz Bandwidth and Their Application in Organic Optocouplers

J Phys Chem Lett. 2022 Jan 27;13(3):815-821. doi: 10.1021/acs.jpclett.1c04137. Epub 2022 Jan 19.

Authors

Zhewei Li¹, Lixian Jiang¹, Xin Rong¹, Qingshun Dong², Huanli Dong³, Liduo Wang¹, Guifang Dong^{1

4}

Affiliations

¹ Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
² State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
³ Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
⁴ Center for Flexible Electronics Technology, Tsinghua University, Beijing 100084, China.

PMID: 35044181
DOI: 10.1021/acs.jpclett.1c04137

Abstract

The photodetector based on methylammonium lead iodide (MAPbI₃) is a promising device for wide wavelength range (380-780 nm) sensitivity. However, its industrial application is limited by the relatively low response speed to the light signal, which has received little attention. Only a few reports show low-bandwidth characteristics (less than 1 MHz at 0.1 cm²). Here, when a cosolvent strategy to manipulate the thickness and the crystallinity of the MAPbI₃ film is adopted, photodetectors with a -3 dB bandwidth of 4.7 MHz are achieved (at 0.16 cm² photo detecting area). The performance is significantly better than most of the organic and hybrid photodetectors reported so far. Based on this photodetector and an organic light-emitting diode (OLED), an organic optocoupler system with 1 MHz response frequency is successfully set up. Our results suggest that thickness-manipulated cosolvent strategy is a promising method in high-speed MAPbI₃-based photodetectors.