Journal ArticleDOI
Side Chain Engineering on Medium Bandgap Copolymers to Suppress Triplet Formation for High-Efficiency Polymer Solar Cells.
Lingwei Xue,Lingwei Xue,Yankang Yang,Jianqiu Xu,Jianqiu Xu,Chunfeng Zhang,Chunfeng Zhang,Haijun Bin,Zhi-Guo Zhang,Beibei Qiu,Xiaojun Li,Chenkai Sun,Liang Gao,Jia Yao,Xiaofeng Chen,YunXu Yang,Min Xiao,Min Xiao,Yongfang Li,Yongfang Li +19 more
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TLDR
It is demonstrated difluoro-substitution of thiophene conjugated side chain on donor polymer can suppress triplet formation for reducing carrier recombination and indicates that side chain engineering can provide a new solution to suppress carrier recombinations toward high efficiency.Abstract:
Suppression of carrier recombination is critically important in realizing high-efficiency polymer solar cells. Herein, it is demonstrated difluoro-substitution of thiophene conjugated side chain on donor polymer can suppress triplet formation for reducing carrier recombination. A new medium bandgap 2D-conjugated D-A copolymer J91 is designed and synthesized with bi(alkyl-difluorothienyl)-benzodithiophene as donor unit and fluorobenzotriazole as acceptor unit, for taking the advantages of the synergistic fluorination on the backbone and thiophene side chain. J91 demonstrates enhanced absorption, low-lying highest occupied molecular orbital energy level, and higher hole mobility, in comparison with its control polymer J52 without fluorination on the thiophene side chains. The transient absorption spectra indicate that J91 can suppress the triplet formation in its blend film with n-type organic semiconductor acceptor m-ITIC (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone)-5,5,11,11-tetrakis(3-hexylphenyl)-dithieno[2,3-d:2,3'-d']-s-indaceno[1,2-b:5,6-b']-dithiophene). With these favorable properties, a higher power conversion efficiency of 11.63% with high VOC of 0.984 V and high JSC of 18.03 mA cm-2 is obtained for the polymer solar cells based on J91/m-ITIC with thermal annealing. The improved photovoltaic performance by thermal annealing is explained from the morphology change upon thermal annealing as revealed by photoinduced force microscopy. The results indicate that side chain engineering can provide a new solution to suppress carrier recombination toward high efficiency, thus deserves further attention.read more
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Journal ArticleDOI
Synthesis of low band-gap 2D conjugated polymers and their application for organic field effect transistors and solar cells
TL;DR: Two donor-acceptor (D-A) 2D conjugated polymers P1 and P2 based on isoindigo and thienoisoindigo (TID) as acceptor unit and 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b´]dithiophene (BDT-T) as donor unit were prepared via Stille coupling and characterized by solution-possessed organic field effect transistors (OFETs
Journal ArticleDOI
Impact of an electron withdrawing group on the thiophene-fused benzotriazole unit on the photovoltaic performance of the derived polymer solar cells
TL;DR: In this article, two donor-acceptor copolymers (P32 and P33) for non-fullerene polymer solar cells (PSCs) have been synthesized based on a thiophene-fused benzotriazole (BTAZT) unit and a substituted benzodithiophene (BDTT) unit.
Journal ArticleDOI
Fluorinated Thieno[2',3':4,5]benzo[1,2-d][1,2,3]triazole: New Acceptor Unit To Construct Polymer Donors.
TL;DR: F fluorine atom is introduced both into the BTAZT unit and the side-chain thiophene ring of the BDT unit, indicating that fBTAzT can be acted as a medium strong organic acceptor to build D–A polymer donor for high efficient PSCs.
Journal ArticleDOI
Charge Recycling Mechanism through a Triplet Charge-Transfer State in Ternary-Blend Organic Solar Cells Containing a Nonfullerene Acceptor
Dongki Lee,Hyeongjin Hwang,Dong Hun Sin,Chaneui Park,Se Gyo Han,Jungho Mun,Jaebum Noh,Sung Hyuk Kim,Hyojung Kim,Hansol Lee,Chanwoo Lee,Junsuk Rho,Kilwon Cho,Mun Seok Jeong +13 more
Journal ArticleDOI
The effect of halogenation on PBDTT-TQxT based non-fullerene polymer solar cells – Chlorination vs fluorination
Ruben Lenaerts,Ruben Lenaerts,Dries Devisscher,Dries Devisscher,Geert Pirotte,Geert Pirotte,Sam Gielen,Sam Gielen,Sigurd Mertens,Sigurd Mertens,Tom Cardeynaels,Tom Cardeynaels,Tom Cardeynaels,Benoît Champagne,Laurence Lutsen,Dirk Vanderzande,Dirk Vanderzande,Peter Adriaensens,Peter Adriaensens,Pieter Verstappen,Pieter Verstappen,Koen Vandewal,Koen Vandewal,Wouter Maes,Wouter Maes +24 more
TL;DR: In this article, a series of push-pull type benzo[1,2-b:4,5-b]-dithiophene-alt-quinoxaline donor polymers and compare the behavior of the non-halogenated, fluorinated and chlorinated derivatives in polymer solar cells when combined with small molecule and polymer type non-fullerene acceptors.
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