Huyen Tran, Sora Oh, Ji-Young Jeong, Namsun Yoon, Chang Eun Song, Hang Ken Lee, Won Suk Shin, Jong-Cheol Lee, Sang Kyu Lee.ACS Applied Materials & Interfaces 2022, 14 Enhanced Photodynamic of Carriers and Suppressed Charge Recombination Enable Approaching 18% Efficiency in Nonfullerene Organic Solar Cells. You-Dan Zhang, Xunchang Wang, Xian Fei, Miaomiao Li, Chenglong Wang, Hao-Li Zhang.Medium Bandgap Nonfullerene Acceptor for Efficient Ternary Polymer Solar Cells with High Open-Circuit Voltage. Shikin, Vladimir Alekseev, Giriraj Chayal, Hemraj Dahiya, Manish Kumar Singh, Fang Chung Chen, Ganesh D. New Type of Polymerized Small A-D-A Acceptors Constructed by Conjugation Extension in the Branched Direction. Kangqiao Ma, Huazhe Liang, Yuxin Wang, Zheng Xiao, Changzun Jiang, Wanying Feng, Zhe Zhang, Xiaodong Si, Jian Liu, Xiangjian Wan, Bin Kan, Chenxi Li, Zhaoyang Yao, Yongsheng Chen.Oligo(ethylene glycol) Side Chain Architecture Enables Alcohol-Processable Conjugated Polymers for Organic Solar Cells. Justin Neu, Stephanie Samson, Kan Ding, Jeromy James Rech, Harald Ade, Wei You.This article is cited by 317 publications. Overall, our work demonstrates not only the validity of high-performance OSCs operating at the near zero HOMO offsets but also the charge dynamic insights of these blends, which will help gain understanding on the further improvement of OSCs.
Surprisingly, small HOMO offsets of 0 and 0.06 eV can also enable high PCEs of 10.42% and 11.75% for blend 2 (PTQ10:HC-PCIC) and blend 3 (PBDB-TF:HC-PCIC), respectively. Furthermore, we compare the device parameters under varied light intensities and discover that the bimolecular recombination should be one of the main restrictions for high device performance. In contrast, a negative HOMO offset can significantly slow down the hole transfer with a half-time of ∼400 ps. Second, to find out whether HOMO offset is the main restriction of hole transfer, we measured transient absorption spectra and examined the hole transfer behavior in the blends, revealing that the occurrence of hole transfer is independent of the HOMO offsets and ultrafast in the time scale of ≤4.6 ps for those blends with ≥0 eV HOMO offsets. It reveals that the asymmetrical diode effect of the bilayer hole-only devices can correlate with the FF and J sc of the relevant OSCs. First, to verify the energetic compatibility of a specific D:A pair, especially for HOMO offsets, we established a simple method to estimate the hole transfer tendencies between D and A by using bilayer hole-only devices. Herein, we investigated a series of fullerene-free organic solar cells (OSCs) based on six different donor:acceptor (D:A) blends with varied highest occupied molecular orbital (HOMO) offsets from −0.05 to 0.21 eV.
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