Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers

Yunhao Cai, Qian Li, Guanyu Lu, Hwa Sook Ryu, Yun Li, Hui Jin, Zhihao Chen, Zheng Tang, Guanghao Lu (), Xiaotao Hao, Han Young Woo, Chunfeng Zhang () and Yanming Sun ()
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Yunhao Cai: Beihang University
Qian Li: Nanjing University
Guanyu Lu: Xi’an Jiaotong University
Hwa Sook Ryu: Korea University
Yun Li: Beihang University
Hui Jin: Donghua University
Zhihao Chen: Shandong University
Zheng Tang: Donghua University
Guanghao Lu: Xi’an Jiaotong University
Xiaotao Hao: Shandong University
Han Young Woo: Korea University
Chunfeng Zhang: Nanjing University
Yanming Sun: Beihang University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The development of organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, an efficiency of 17.31% (certified value of 16.9%) is obtained for the 300 nm-thick OSC, with a short-circuit current density of 28.36 mA cm−2, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows an efficiency of 15.21%. This work provides valuable insights into the fabrication of OSCs with thick active layers.

Date: 2022
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DOI: 10.1038/s41467-022-29803-6

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