標題: Enhanced Organic Solar Cell Performance by Lateral Side Chain Engineering on Benzodithiophene-Based Small Molecules
作者: Patra, Dhananjaya
Budiawan, Widhya
Huang, Tzu-Yen
Wei, Kung-Hwa
Wang, Pen-Cheng
Ho, Kuo-Chuan
Al-Hashimi, Mohammed
Chu, Chih-Wei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: solution-processed;small-molecule organic solar cell;bulk heterojunction;side chain;benzodithiophene
公開日期: 1-Aug-2018
摘要: The three novel acceptor-donor-acceptor (A-D-A) conjugated small molecules were synthesized, each featuring a benzodithiophene (BDT) core presenting lateral flexible side chains: TB-BDT6T substituted with 2-ethynyl-5-octylthiophene, TS-BDT6T substituted with 2-(octylthio)-thiophene, and TT-BDT6T substituted with 2-(2-ethylhexyl)-thieno[3,2-b]thiophene groups. The lateral incorporation of functionalized pi-conjugated flexible side chains, without altering the end-capped acceptor (cyanoacetate) moieties, amended the optoelectronic properties of these BDT-based small molecules. X-ray diffraction spectroscopy revealed that these small molecules possess high crystallinity; moreover, the optimized blend film morphologies, recorded using atomic force microscopy, revealed miscibility with PC61BM, and turn out nanoscale phase separations. The energy levels of the highest occupied and lowest unoccupied molecular orbitals of these small molecules were allowed, leading to high open-circuit voltages (V-oc) for their solar cell devices. The bulk heterojunction small-molecule solar cell based on TT-BDT6T:PC61BM blend presented the highest power conversion efficiency (5.80%) with a high value of V-oc of 0.98 V, a short circuit density of 9.49 mA cm(-2), and a fill factor of 62.44% under AM 1.5G irradiation (100 mW cm(-2)).
URI: http://dx.doi.org/10.1021/acsaem.8b00415
http://hdl.handle.net/11536/153541
ISSN: 2574-0962
DOI: 10.1021/acsaem.8b00415
期刊: ACS APPLIED ENERGY MATERIALS
Volume: 1
Issue: 8
起始頁: 3684
結束頁: 3692
Appears in Collections:Articles