Abstract
Although high efficiencies have been demonstrated in organic solar cells (OSCs), the development of semitransparent devices is still lagging behind due to the difficulty in making a balance between the active layer absorption and device transmittance. To address this challenge, a detailed study of semitransparent OSCs (ST-OSCs) based on the blends of the low bandgap polymer PTB7-Th and ultra-narrow bandgap nonfullerene acceptor IEICO-4F is carried out. Comprehensive optical modeling using the transfer matrix method (TMM) has been performed to assist the design of ST-OSCs and understand the effect of active layer composition and distributed Bragg reflectors (DBRs) on the device performance. By varying the PTB7-Th/IEICO-4F blending ratio from 1:1.5 to 1:3 and incorporating of DBRs, the average visible transmittance (AVT) of the ST-OSCs was dramatically increased by over 26% with a slight decrease in photocurrent (Jmax) less than 5%. This significant improved light utilization can be attributed to the enhanced photon harvesting of NIR range and decreased visible light absorption by increasing the IEICO-4F content, as well as the optimal optical properties in the ST-OSCs with the use of DBRs. Our results can provide a feasible way to optimize the light harvesting and transmittance of the device for achieving high-performance ST-OSCs.
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Acknowledgements
This work was partly supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY21F050004), National Nature Science Foundation of China (NSFC) (Grant No. 61904168, 61705054 and 52072355).
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Zang, Y., Chen, L., Zhou, J. et al. Enhanced light utilization in semitransparent organic solar cells based on a nonfullerene acceptor of IEICO-4F. Appl. Phys. A 127, 889 (2021). https://doi.org/10.1007/s00339-021-05025-3
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DOI: https://doi.org/10.1007/s00339-021-05025-3