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Title: As‐Cast Ternary Organic Solar Cells Based on an Asymmetric Side‐Chains Featured Acceptor with Reduced Voltage Loss and 14.0% Efficiency

Journal Article · · Advanced Functional Materials
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [3];  [5];  [5];  [6]
  1. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA, State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology 381 Wushan Road Guangzhou 510640 China
  2. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA
  3. Department of Physics and Astronomy Shanghai Jiaotong University Shanghai 200240 China
  4. Department of Chemistry University of Washington Seattle WA 98195 USA
  5. State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology 381 Wushan Road Guangzhou 510640 China
  6. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA, Department of Chemistry University of Washington Seattle WA 98195 USA, Department of Chemistry City University of Hong Kong Kowloon 999077 Hong Kong

Abstract A new small‐molecule nonfullerene acceptor based on the benzo[1,2‐ b :4,5‐ b ′]dithiophene (BDT) fused central core with asymmetrical alkoxy and thienyl side chains, namely TOBDT , is designed and synthesized. The alkoxy unit helps narrow the bandgap, and thienyl side chain helps enhance the intermolecular interaction. As a result, TOBDT is suitable to match the deep‐lying highest occupied molecular orbital (HOMO) of polymer donor PM6 . Then, a strong crystalline acceptor IDIC is introduced as the third component to fabricate as‐cast nonfullerene ternary devices to achieve absorption and morphology control. Addition of IDIC not only mixes well with TOBDT but modulates the morphology of the blend film, which helps to balance the charge transport properties and reduce the photovoltage loss of ternary devices. All these contribute to synergetic improvement of J sc , V oc , and fill factor parameters, leading to a power conversion efficiency of 14.0% for the as‐cast fullerene‐free ternary device.

Sponsoring Organization:
USDOE
OSTI ID:
1593472
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 11 Vol. 30; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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