Journal ArticleDOI
Charge Separation from an Intra-Moiety Intermediate State in the High-Performance PM6:Y6 Organic Photovoltaic Blend
TLDR
It is reported that the hole transfer channel of photocharge generation is mediated by an intra-moiety excited state in a blend of donor polymer PM6 and NFA Y6 using broadband transient absorption (TA) spectroscopy, suggesting that manipulating the interplay between intra-Moiety and interfacial excited species can provide a promising route for further improving device performance.Abstract:
Bulk-heterojunction organic photovoltaic devices with nonfullerene acceptors (NFAs) exhibit efficient hole transfer with small interfacial energy offset, which results in power conversion efficiencies above 17% in single junction devices using the high-performance NFA of Y6. However, the underlying mechanism responsible for the hole transfer channel in the polymer/Y6 blends remains poorly understood. Herein, we report that the hole transfer channel of photocharge generation is mediated by an intra-moiety excited state in a blend of donor polymer PM6 and NFA Y6 using broadband transient absorption (TA) spectroscopy. By comparing the TA data recorded from the solution and film Y6 samples, we identify the ultrafast formation of an intra-moiety excimer state together with the conversion from the primary local excitation on a time scale of ∼0.2 ps in the Y6 film. The intra-moiety excimer state acts as the intermediate for the hole transfer channel, which dissociates into free polarons on a time scale of ∼15 ps in the PM6/Y6 blend at room temperature. The intra-moiety intermediate state, arising from the intermolecular coupling in Y6 domains, is markedly different from the interfacial charge transfer state, which is commonly accepted as the intermediate state for the electron transfer channel. These findings suggest that manipulating the interplay between intra-moiety and interfacial excited species can provide a promising route for further improving device performance.read more
Citations
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Journal ArticleDOI
Single-Junction Organic Photovoltaic Cell with 19% Efficiency
Yong Cui,Ye Xu,Huifeng Yao,Pengqing Bi,Ling Hong,Jianqi Zhang,Yunfei Zu,Tao Zhang,Jinzhao Qin,Junzhen Ren,Zhihao Chen,Chang He,Xiaotao Hao,Zhixiang Wei,Zhixiang Wei,Jianhui Hou +15 more
TL;DR: In this paper, an active layer comprising a new widebandgap polymer donor named PBQx-TF and a new low-bandgap non-fullerene acceptor (NFA) named eC9-2Cl is rationally designed.
Journal ArticleDOI
Reduced non-radiative charge recombination enables organic photovoltaic cell approaching 19% efficiency
Pengqing Bi,Shaoqing Zhang,Zhihao Chen,Ye Xu,Yong Cui,Tao Zhang,Junzhen Ren,Jinzhao Qin,Ling Hong,Xiaotao Hao,Jianhui Hou +10 more
TL;DR: In this paper, an increase in the exciton diffusion length (LD) in the acceptor phase via introducing HDO-4Cl to the PBDB-TF:eC9-based system was achieved.
Journal ArticleDOI
A Well-Mixed Phase Formed by Two Compatible Non-Fullerene Acceptors Enables Ternary Organic Solar Cells with Efficiency over 18.6%
Yunhao Cai,Yun Li,Rui Wang,Hongbo Wu,Zhihao Chen,Jie Zhang,Zaifei Ma,Xiaotao Hao,Yong Zhao,Chunfeng Zhang,Fei Huang,Yanming Sun +11 more
TL;DR: In this paper, a novel non-fullerene acceptor L8-BO-F is designed and incorporated into the PM6:BTP-eC9 blend, which shows complementary absorption spectra and cascade energy alignment.
Journal ArticleDOI
Organic Solar Cells with 18% Efficiency Enabled by an Alloy Acceptor: A Two-in-One Strategy
Feng Liu,Feng Liu,Liang Zhou,Wenrui Liu,Zichun Zhou,Qihui Yue,Wenyu Zheng,Ri Sun,Wuyue Liu,Shengjie Xu,Haijun Fan,Liheng Feng,Yuanping Yi,Weiya Zhang,Xiaozhang Zhu +14 more
TL;DR: In this paper, a ternary solar cell with a power conversion efficiency of over 18% using a largebandgap polymer donor, PM6, and a small-bandgap alloy acceptor containing two structurally similar nonfullerene acceptors (Y6 and AQx-3) is reported.
Journal ArticleDOI
Polymerized Small Molecule Acceptors for High Performance All‐polymer Solar Cells
TL;DR: The design strategies of the molecular structure of PSMAs are explained and the recent research progress of the PSM as is introduced to introduce the current challenges and future prospects of thePSMAs.
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