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

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

Qiang Zhang, Zhenyu Chen, Wei Ma, Zhiyuan Xie, Jiangang Liu, Xinhong Yu, Yanchun Han

ACS Appl Mater Interfaces. 2019 Sep 4;11(35):32200-32208.

PMID: 31407879

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%).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1393529037	J51		1393529-03-7	Price

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