Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology

In organic photovoltaics, morphological control of donor and acceptor domains on the nanoscale is the key for enabling efficient exciton diffusion and dissociation, carrier transport and suppression of recombination losses. To realize this, here, we demonstrated a double-fibril network based on a te...

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Bibliographic Details
Published in:Nature materials Vol. 21; no. 6; pp. 656 - 663
Main Authors: Zhu, Lei, Zhang, Ming, Xu, Jinqiu, Li, Chao, Yan, Jun, Zhou, Guanqing, Zhong, Wenkai, Hao, Tianyu, Song, Jiali, Xue, Xiaonan, Zhou, Zichun, Zeng, Rui, Zhu, Haiming, Chen, Chun-Chao, MacKenzie, Roderick C. I., Zou, Yecheng, Nelson, Jenny, Zhang, Yongming, Sun, Yanming, Liu, Feng
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01.06.2022
Nature Publishing Group
Springer Nature
Subjects:
140/125
639/301/299/946
639/624/399/1028
639/766/1130/2799
Assembly
Biomaterials
Carrier transport
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Crystallizers
Diffusion length
Diffusion rate
Efficiency
Energy conversion efficiency
Excitons
Materials Science
Morphology
Nanotechnology
Optical and Electronic Materials
Photoelectricity
Photovoltaic cells
Photovoltaics
Physics
Polymers
Solar cells
ISSN:1476-1122, 1476-4660, 1476-4660
Online Access:Get full text
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Summary:In organic photovoltaics, morphological control of donor and acceptor domains on the nanoscale is the key for enabling efficient exciton diffusion and dissociation, carrier transport and suppression of recombination losses. To realize this, here, we demonstrated a double-fibril network based on a ternary donor–acceptor morphology with multi-length scales constructed by combining ancillary conjugated polymer crystallizers and a non-fullerene acceptor filament assembly. Using this approach, we achieved an average power conversion efficiency of 19.3% (certified 19.2%). The success lies in the good match between the photoelectric parameters and the morphological characteristic lengths, which utilizes the excitons and free charges efficiently. This strategy leads to an enhanced exciton diffusion length and a reduced recombination rate, hence minimizing photon-to-electron losses in the ternary devices as compared to their binary counterparts. The double-fibril network morphology strategy minimizes losses and maximizes the power output, offering the possibility of 20% power conversion efficiencies in single-junction organic photovoltaics. The morphology of donor–acceptor blends in organic photovoltaics dictates the efficiency of the exciton dissociation and charge diffusion, and thus the final device performance. Here, the authors show that filament assembly helps to maximize the output, further enabling a power conversion efficiency greater than 19%.
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USDOE
AC02-05CH11231
ISSN:1476-1122
1476-4660
1476-4660
DOI:10.1038/s41563-022-01244-y