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Highly Efficient Polymer Tandem Cells and Semitransparent Cells for Solar Energy
Author(s) -
Chang ChihYu,
Zuo Lijian,
Yip HinLap,
Li ChangZhi,
Li Yongxi,
Hsu ChainShu,
Cheng YenJu,
Chen Hongzheng,
Jen Alex KY.
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201301645
Subject(s) - materials science , tandem , polymer solar cell , energy conversion efficiency , transmittance , band gap , polymer , active layer , open circuit voltage , optoelectronics , solar cell , chemical engineering , layer (electronics) , nanotechnology , voltage , composite material , electrical engineering , engineering , thin film transistor
Highly efficient tandem and semitransparent (ST) polymer solar cells utilizing the same donor polymer blended with [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (PC 61 BM) and [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (PC 71 BM) as active layers are demonstrated. A high power conversion efficiency (PCE) of 8.5% and a record high open‐circuit voltage of 1.71 V are achieved for a tandem cell based on a medium bandgap polymer poly(indacenodithiophene‐ co ‐phananthrene‐quinoxaline) (PIDT‐phanQ). In addition, this approach can also be applied to a low bandgap polymer poly[2,6‐(4,4‐bis(2‐ethylhexyl)‐4H‐cyclopenta[2,1‐b;3,4‐b′]dithiophene)‐alt‐4,7‐(5‐fluoro‐2,1,3‐benzothia‐diazole)] (PCPDTFBT), and PCEs up to 7.9% are achieved. Due to the very thin total active layer thickness, a highly efficient ST tandem cell based on PIDT‐phanQ exhibits a high PCE of 7.4%, which is the highest value reported to date for a ST solar cell. The ST device also possesses a desirable average visible transmittance (≈40%) and an excellent color rendering index (≈100), permitting its use in power‐generating window applications.