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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
The Path to 20% Power Conversion Efficiencies in Nonfullerene Acceptor Organic Solar Cells
Journal ArticleDOI
Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers.
Yufei Zhong,Martina Causa,Gareth John Moore,Philipp Krauspe,Bo Xiao,Florian Günther,Jonas Kublitski,Rishi Shivhare,Johannes Benduhn,Eyal BarOr,Subhrangsu Mukherjee,Kaila Morgan Yallum,Julien Réhault,Stefan C. B. Mannsfeld,Dieter Neher,Lee J. Richter,Dean M. DeLongchamp,Frank Ortmann,Koen Vandewal,Erjun Zhou,Natalie Banerji +20 more
TL;DR: It is shown that the driving force can be as small as 0.05 eV without compromising the charge transfer rate and efficiency, and in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff.
Journal ArticleDOI
The Introduction of Fluorine and Sulfur Atoms into Benzotriazole‐Based p‐Type Polymers to Match with a Benzotriazole‐Containing n‐Type Small Molecule: “The Same‐Acceptor‐Strategy” to Realize High Open‐Circuit Voltage
Journal ArticleDOI
Side-Chain Impact on Molecular Orientation of Organic Semiconductor Acceptors: High Performance Nonfullerene Polymer Solar Cells with Thick Active Layer over 400 nm
Zhenghui Luo,Zhenghui Luo,Chenkai Sun,Shanshan Chen,Zhi-Guo Zhang,Kailong Wu,Beibei Qiu,Changduk Yang,Yongfang Li,Chuluo Yang,Chuluo Yang +10 more
Journal ArticleDOI
Promoting charge separation resulting in ternary organic solar cells efficiency over 17.5
Qing Ma,Zhenrong Jia,Lei Meng,Jinyuan Zhang,Huotian Zhang,Wenchao Huang,Wenchao Huang,Jun Yuan,Feng Gao,Yan Wan,Zhanjun Zhang,Yongfang Li,Yongfang Li +12 more
TL;DR: In this article, a non-fullerene small molecule acceptor (C8-DTC) was synthesized and added to the PM6:Y6 system as a third component.
References
More filters
Journal ArticleDOI
Polymer photovoltaic cells : enhanced efficiencies via a network of internal donor-acceptor heterojunctions
TL;DR: In this paper, the carrier collection efficiency and energy conversion efficiency of polymer photovoltaic cells were improved by blending of the semiconducting polymer with C60 or its functionalized derivatives.
Journal ArticleDOI
Polymer–Fullerene Composite Solar Cells
TL;DR: Polymer-based organic photovoltaic systems hold the promise for a cost-effective, lightweight solar energy conversion platform, which could benefit from simple solution processing of the active layer.
Journal ArticleDOI
Polymer solar cells
TL;DR: In this article, a review summarizes recent progress in the development of polymer solar cells and provides a synopsis of major achievements in the field over the past few years, while potential future developments and the applications of this technology are also briefly discussed.
Journal ArticleDOI
Synthesis of Conjugated Polymers for Organic Solar Cell Applications
TL;DR: Fluorene-Based Copolymers ContainingPhosphorescent Complexes and Carbazole-Based Conjugated Polymers R5.1.3.
Journal ArticleDOI
An electron acceptor challenging fullerenes for efficient polymer solar cells.
TL;DR: A novel non-fullerene electron acceptor (ITIC) that overcomes some of the shortcomings of fullerene acceptors, for example, weak absorption in the visible spectral region and limited energy-level variability, is designed and synthesized.