Premium
Oxide Layer Enhances Photocurrent Gain of the Planar MAPbI 3 Photodetector
Author(s) -
Gegevičius Rokas,
Treideris Marius,
Pakštas Vidas,
Franckevičius Marius,
Gulbinas Vidmantas
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800114
Subject(s) - photocurrent , materials science , photodetector , optoelectronics , perovskite (structure) , planar , electrode , layer (electronics) , oxide , dark current , crystallite , electron , current (fluid) , nanotechnology , chemical engineering , chemistry , electrical engineering , computer graphics (images) , physics , quantum mechanics , computer science , engineering , metallurgy
Even though the current development of hybrid perovskite photodetectors makes them competitive with their inorganic analogs, a detailed fundamental understanding of their operating principles is still lacking. Here, the performance of planar polycrystalline perovskite photodetectors fabricated on interdigitated comb electrodes made from various metals is studied. It is demonstrated that the oxide layer on Cr and Pt electrodes increases the photo current gain by an order of magnitude. It is suggested that the gain enhancement originates from the hindered extraction of photogenerated holes and the migration of ions, which creates additional hole‐traps at interfaces. These effects reduce the barrier for electron injection and enable the passage of a larger number of electrons during the prolonged lifetime of photogenerated holes.