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Efficient Nonhalogenated Solvent-Processed Ternary All-Polymer Solar Cells with a Favorable Morphology Enabled by Two Well-Compatible Donors. | LitMetric

Efficient Nonhalogenated Solvent-Processed Ternary All-Polymer Solar Cells with a Favorable Morphology Enabled by Two Well-Compatible Donors.

ACS Appl Mater Interfaces

State Key Laboratory of Polymer Physics and Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , 5625 Renmin Street , Changchun 130022 , China.

Published: September 2019

AI Article Synopsis

  • The study focuses on optimizing the morphology of ternary all-polymer solar cells (all-PSCs) to improve their performance by using two miscible polymer donors, J51 and PTB7-Th, along with the acceptor N2200.
  • By combining these materials, the researchers achieved a uniform phase separation that reduces undesirable large phase separation, enhancing the overall efficiency of the solar cells.
  • The results showed that the optimal weight ratio of PTB7-Th at 30% led to a power conversion efficiency (PCE) of 9.60%, outperforming binary all-PSCs, which had lower efficiencies of 7.58% and 5.63%.

Article Abstract

The rational design of the morphology of ternary all-polymer solar cells (all-PSCs) having broadened photon harvesting is crucial to achieve high device performance. However, multicomponent blends often illustrated an unfavorable morphology such as large-sized phase separation due to their complicated interaction. Herein, we proposed to solve these problems by employing two donors with good miscibility (J51 and PTB7-Th), which also have similar compatibility with the acceptor (N2200). The resultant ternary blend films of J51:PTB7-Th:N2200 feature a uniform phase separation morphology due to the reduced competitive effect of intermolecular interactions. As an additional polymer donor, PTB7-Th could not only enhance the absorption of the binary blend but also act as a crystallization regulator to boost the face-on orientation in ternary blends. Accordingly, the J51:PTB7-Th:N2200 ternary blends exhibited improved sunlight absorption and higher and well-balanced carrier mobility accompanied by enhanced carrier extraction. With the nonhalogenated cyclopentyl methyl ether as the processing solvent, the ternary all-PSCs showed outstanding power conversion efficiency (PCE) higher than 9% when varying the PTB7-Th weight ratio in donors from 20 to 50%. Due to the PTB7-Th content holding a 30% weight ratio in donors, the ternary all-PSCs demonstrated the optimal PCE of 9.60%, which perform better than those of binary all-PSCs (PCE = 7.58 or 5.63%).

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Source
http://dx.doi.org/10.1021/acsami.9b06963DOI Listing

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