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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Control of geminate recombination by the material composition and processing conditions in novel polymer: Nonfullerene acceptor photovoltaic devices
Jiangbin Zhang,Jiangbin Zhang,Qinying Gu,Qinying Gu,Thu Trang Do,Kira Rundel,Prashant Sonar,Richard H. Friend,Christopher R. McNeill,Artem A. Bakulin +9 more
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Highly thermally stable all-polymer solar cells enabled by photo-crosslinkable bromine-functionalized polymer donors
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Synthesis of Conjugated Wide-Bandgap Copolymers Bearing Ladder-Type Donating Units and Their Application to Non-Fullerene Polymer Solar Cells
Mai Ha Hoang,Gi Eun Park,Gi Eun Park,Dinh Long Phan,Trinh Tung Ngo,Tuyen Van Nguyen,Chang Geun Park,Min Ju Cho,Donghoon Choi +8 more
TL;DR: In this paper, the effects of the IDT and IDTT units on the physical, optical, and electrochemical properties of these copolymers were investigated, and the PSCs bearing the as-cast active layers with 2.2′-((2Z,2′Z)-((4,4,9,9-tetrakis(4-hexylphenyl)-4, 9,9)-tetrasnyl-s-indaceno[1,2-b:5,6-b′] dithiophene-
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Recent Structural Engineering of Polymer Semiconductors Incorporating Hydrogen Bonds
TL;DR: In this paper , a general summary of high-mobility semiconducting polymers incorporating hydrogen bonds in field effect transistors over recent years is provided, and the structural engineering of the hydrogen bond-containing building blocks and the discussion of theoretical simulation, microstructural characterization, and device performance are covered.
Journal ArticleDOI
Synthesis and Photovoltaic Investigation of 8,10-Bis(2-octyldodecyl)-8,10-dihydro-9H-bisthieno[2′,3′:7,8;3″,2″:5,6] naphtho[2,3-d]imidazol-9-one Based Conjugated Polymers Using a Nonfullerene Acceptor
Mukhamed L. Keshtov,Serge A. Kuklin,Alexei R. Khokhlov,Alexei R. Khokhlov,Zhiyuan Xie,Chuandong Dou,Yingping Zou,Iiya E. Ostapov,Iiya E. Ostapov,Elena E. Makhaeva,Rakesh Suthar,Ganesh D. Sharma +11 more
TL;DR: Two donor-acceptor (D-A) conjugated polymers designed on the same 8,10-bis(2-octyldodecyl)-8, 10-dihydro-9H-bisthieno [2′,3′:7,8;3″,2″:5,6]naphtho[2,3- d]imidazole-9-one donor and dissimilar acceptor uni...
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