Open AccessImproved performance of perovskite photodetectors with a hybrid planar-mixed heterojunction
Author(s) -
Hairuo Wu,
Bei Chu,
Zisheng Su
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab98c9
Subject(s) - photocurrent , heterojunction , materials science , responsivity , photodetector , optoelectronics , perovskite (structure) , doping , planar , exciton , charge carrier , chemistry , crystallography , condensed matter physics , computer graphics (images) , physics , computer science
Improved performance of lateral perovskite photodetectors is demonstrated based on a hybrid planar-mixed heterojunction structure, which comprises a CH 3 NH 3 PbI 3 :PC 61 BM ([6,6]-phenyl-C61-butyric acid methyl ester) bulk heterojunction on a planar SnO 2 layer. The photodetector with an optimized PC 61 BM doping concentration shows a photocurrent more than three times to that device without a PC 61 BM doping or without a planar SnO 2 layer, confirming that the hybrid planar-mixed heterojunction structure plays an important role in improving the performance of the devices. The photodetector exhibits a responsivity higher than 2 A W −1 in a wide range from ultraviolet to near infrared with a maximum one of 9 A W −1 at 315 nm. The improved performance is not only attributed to the increased electron transporting ability and the dissociation probability of excitons and/or electron-hole pairs in perovskite, but also to the growth of compact perovskite films with decreased grain boundary and hence the increased charge carriers transporting efficiency due to the introduction of PC 61 BM.