Chlorination Enabling a Low-Cost Benzodithiophene-Based Wide-Bandgap Donor Polymer with an Efficiency of over 17

Hang Wang; Hao Lu; Ya-Nan Chen; Guangliu Ran; Andong Zhang; Dawei Li; Na Yu; Zhe Zhang; Yahui Liu; Xinjun Xu; Wenkai Zhang; Qinye Bao; Zheng Tang; Zhishan Bo

doi:10.1002/adma.202105483

Chlorination Enabling a Low-Cost Benzodithiophene-Based Wide-Bandgap Donor Polymer with an Efficiency of over 17

Adv Mater. 2022 Jan;34(4):e2105483. doi: 10.1002/adma.202105483. Epub 2021 Dec 10.

Authors

Hang Wang¹, Hao Lu², Ya-Nan Chen¹, Guangliu Ran³, Andong Zhang¹, Dawei Li⁴, Na Yu⁵, Zhe Zhang⁴, Yahui Liu¹, Xinjun Xu², Wenkai Zhang³, Qinye Bao⁶, Zheng Tang⁵, Zhishan Bo^{1

2}

Affiliations

¹ College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao, 266071, China.
² Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, China.
³ Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875, China.
⁴ Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
⁵ Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials, Science and Engineering, Donghua University, Shanghai, 201620, China.
⁶ Key Laboratory of Polar Materials and Devices, Department of Optoelectronics, East China Normal University, Shanghai, 200241, China.

PMID: 34773717
DOI: 10.1002/adma.202105483

Abstract

Three regioregular benzodithiophene-based donor-donor (D-D)-type polymers (PBDTT, PBDTT1Cl, and PBDTT2Cl) are designed, synthesized, and used as donor materials in organic solar cells (OSCs). Because of the weak intramolecular charge-transfer effect, these polymers exhibit large optical bandgaps (>2.0 eV). Among these three polymers, PBDTT1Cl exhibits more ordered and closer molecular stacking, and its devices demonstrate higher and more balanced charge mobilities and a longer charge-separated state lifetime. As a result of these comprehensive benefits, PBDTT1Cl-based OSCs give a very impressive power conversion efficiency (PCE) of 17.10% with a low nonradiative energy loss (0.19 eV). Moreover, PBDTT1Cl also possesses a low figure-of-merit value and good universality to match with different acceptors. This work provides a simply and efficient strategy to design low-cost high-performance polymer donor materials.

Keywords: charge mobility; molecular stacking; organic solar cells; polymer donor materials; wide-bandgap donor polymers.

Abstract

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