Surpassing the 10% efficiency milestone for 1-cm2 all-polymer solar cells

Baobing Fan, Wenkai Zhong, Lei Ying (), Difei Zhang, Meijing Li, Yanrui Lin, Ruoxi Xia, Feng Liu, Hin-Lap Yip, Ning Li (), Yuguang Ma, Christoph J. Brabec, Fei Huang () and Yong Cao
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Baobing Fan: South China University of Technology
Wenkai Zhong: South China University of Technology
Lei Ying: South China University of Technology
Difei Zhang: South China University of Technology
Meijing Li: South China University of Technology
Yanrui Lin: South China University of Technology
Ruoxi Xia: South China University of Technology
Feng Liu: Shanghai Jiao Tong University
Hin-Lap Yip: South China University of Technology
Ning Li: Friedrich-Alexander-Universität Erlangen-Nürnberg
Yuguang Ma: South China University of Technology
Christoph J. Brabec: Friedrich-Alexander-Universität Erlangen-Nürnberg
Fei Huang: South China University of Technology
Yong Cao: South China University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Naphthalenediimide-based n-type polymeric semiconductors are extensively used for constructing high-performance all-polymer solar cells (all-PSCs). For such all-polymer systems, charge recombination can be reduced by using thinner active layers, yet suffering insufficient near-infrared light harvesting from the polymeric acceptor. Conversely, increasing the layer thickness overcomes the light harvesting issue, but at the cost of severe charge recombination effects. Here we demonstrate that to manage light propagation within all-PSCs, a thick bulk-heterojunction film of approximately 350 nm is needed to effectively enhance photo-harvesting in the near-infrared region. To overcome the severe charge recombination in such a thick film, a non-halogenic additive is used to induce a well-ordered micro-structure that inherently suppresses recombination loss. The combined strategies of light management and delicate morphology optimization lead to a promising efficiency over 10% for thick-film all-PSCs with active area of 1 cm2, showing great promise for future large-scale production and application of all-PSCs.

Date: 2019
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DOI: 10.1038/s41467-019-12132-6

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