Premium
Near infrared photodetectors based on sub‐gap absorption in organohalide perovskite single crystals
Author(s) -
Lin Qianqian,
Armin Ardalan,
Burn Paul L.,
Meredith Paul
Publication year - 2016
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201600215
Subject(s) - responsivity , photocurrent , photodetector , materials science , optoelectronics , absorption (acoustics) , perovskite (structure) , photoconductivity , photoresistor , crystal (programming language) , single crystal , infrared , crystallization , optics , chemistry , physics , crystallography , computer science , programming language , composite material , organic chemistry
Organohalide perovskite optoelectronics based upon large (mm‐sized) single crystals present exciting opportunities for new device platforms and fundamental studies. Herein, we report CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbI 3 single crystals prepared via an inverse temperature crystallization method with strong near infrared photoresponses significantly below the optical gap. Light intensity dependent photocurrent measurements reveal the photoresponse is not a two‐photon phenomenon, but rather is derived from a linear mechanism. The effect (including responsivity and speed) is enhanced in a photoresistor architecture, indicating that the photoresponse is due to absorption into surface trap states in the crystal. Without any optimisation, respectable NIR responsivities at room temperature of ∼10 ‐2 A W −1 at a low 1V bias operating voltage are achieved. These results again demonstrate the remarkable potential of organohalide perovskites as light sensing materials, and the possibilities for engineering a new class of single crystal‐based optoelectronics.