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Improved photocurrent of PDPP3T based organic Schottky junctions via solution‐processed HAT‐CN and TPBi as anode and cathode buffer layers
Author(s) -
Yang Fang,
Wang Chao,
Yu Jun Le,
Zheng Yan Qiong,
Wei Bin,
Li Xi Feng,
Yang Xu Yong
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700178
Subject(s) - pedot:pss , photocurrent , materials science , cathode , evaporation , anode , styrene , schottky barrier , optoelectronics , layer (electronics) , chemical engineering , nanotechnology , chemistry , electrode , polymer , copolymer , composite material , physics , diode , engineering , thermodynamics
All‐solution processed organic Schottky junctions (OSJs) with a near‐infrared absorbing donor material poly(diketopyrrolopyrrole‐terthiophene) (PDPP3T) of 5 wt.% mixed into [6,6]‐phenyl‐C61‐butyric acid methyl ester (PC 61 BM) were fabricated. Solution‐processed 1,4,5,8,9,11‐hexaazatriphenylenehexacarbonitrile (s‐HAT‐CN) and N‐arylbenzimidazoles (s‐TPBi) served as the hole and electron transporting layer (HTL and ETL), which was usually prepared by thermal‐evaporation. The power conversion efficiency (PCE) was improved from 1.15 to 1.45%, compared with the control device with traditional poly(3,4‐ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) and bathocuproine (BCP) as the HTL and ETL. It could be ascribed to the efficient hole extraction by s‐HAT‐CN and smoother surface, and thus, lower trap density of s‐TPBi. s‐HAT‐CN showed a comparable transparency and higher hole mobility than PEDOT:PSS, and was proved to be an efficient and promising HTL for solution‐processed OSJs. The dependence of OSJ performances on the evaporation‐ and solution‐processed 4,7‐diphenyl‐1,10‐phenanthroline (Bphen) and TPBi was comparably investigated. s‐Bphen and s‐TPBi devices both demonstrated a higher photocurrent relative to the evaporation‐processed Bphen and TPBi devices.