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Title: | Thickness insensitive organic solar cells with high figure-of-merit-X enabled by simultaneous D/A interpenetration and stratification | Authors: | Xie, X Ma, R Luo, Y Dela Peña, TA Fong, PWK Luo, D Chandran, HT Jia, T Li, M Wu, J Kyaw, AKK Li, G |
Issue Date: | 2024 | Source: | Advanced energy materials, First published: 14 June 2024, Early View, 2401355, https://doi.org/10.1002/aenm.202401355 | Abstract: | Low cost and printing friendly fabrication of organic solar cells (OSCs) require thick-film devices with simply structured photoactive molecules. Thus, achieving high power conversion efficiency (PCE) for non-fused ring acceptor-based devices with high thickness is of great significance. Herein, by transforming traditional blend casting method to emerging sequential deposition (SD) method, D18:A4T-16 active blend exhibits large efficiency improvement from 8.02% to 14.75% in 300 nm thick devices. Systematic morphological and photophysical characterizations showcase the effectiveness of SD processing in achieving sufficient donor/acceptor interpenetration and vertical stratification, which eliminates the dilemma of charge generation/transport in blend casting films. Meanwhile, D18 bottom layer is proven helpful in realizing fast evaporation of postdeposited poor solvent, resulting in naturally thickened active layer with well-regulated crystallization. Furthermore, a new index to emphasize thick-film devices based on nonfused ring acceptors, called figure-of-merit-X (FoM-X), has been defined. The SD processed D18:A4T-16 devices herein, with 300 nm, 500 nm, and 800 nm thicknesses possess leading FoM-X values. | Keywords: | Nonfused ring acceptor Organic solar cells Power conversion efficiency Sequential deposition Thick film |
Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA | Journal: | Advanced energy materials | ISSN: | 1614-6832 | EISSN: | 1614-6840 | DOI: | 10.1002/aenm.202401355 | Rights: | © 2024 The Author(s). Advanced Energy Materials published byWiley-VCH GmbH. This is an open access article under the terms of theCreative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distributionand reproduction in any medium, provided the original work is properlycited. The following publication X. Xie, R. Ma, Y. Luo, T. A. Dela Peña, P. W.-K. Fong, D. Luo, H. T. Chandran, T. Jia, M. Li, J. Wu, A. K. K. Kyaw, G. Li, Thickness Insensitive Organic Solar Cells with High Figure-of-Merit-X Enabled by Simultaneous D/A Interpenetration and Stratification. Adv. Energy Mater. 2024, 2401355 is available at https://doi.org/10.1002/aenm.202401355. |
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