Reconciling models of interfacial state kinetics and device performance in organic solar cells: impact of the energy offsets on the power conversion efficiency.
Reconciling models of interfacial state kinetics and device performance in organic solar cells: impact of the energy offsets on the power conversion efficiency.
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DOI：
10.1039/d1ee02788c
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发表时间：
2022-03-16
影响因子：
32.5
通讯作者：
Nelson J
中科院分区：
文献类型：
--
作者：
Azzouzi M;Gallop NP;Eisner F;Yan J;Zheng X;Cha H;He Q;Fei Z;Heeney M;Bakulin AA;Nelson J
实现开路电压（Voc），短路电流（Jsc）和填充因子（FF）的同时增加，以进一步提高有机光催化剂（OPV）的功率转换效率（PCE），需要统一的理解分子和器件参数如何影响所有三个特性。在这方面的贡献，我们介绍了一个框架，第一次结合不同的模型，已分别用于描述不同的步骤的电荷产生和收集过程中的OPV器件：一个半经典的速率模型的电荷复合过程中的OPV器件，零维动力学模型的光生过程和激子解离和一维半导体器件模型。使用这种统一的多尺度模型结合实验技术（时间分辨吸收光谱，稳态和瞬态光电测量），探测电荷产生中涉及的各个步骤，我们可以揭示如何在一系列聚合物的能量偏移：非富勒烯设备影响的电荷载流子的产生，收集和重组性能的设备。我们发现，改变供体的能级显着影响不仅本地激子（LE）和电荷转移（CT）状态之间的跃迁速率，但也显着改变CT和电荷分离（CS）状态之间的跃迁速率，挑战普遍接受的图片电荷产生和复合。这些结果表明，为了获得一个准确的图片中的OPV设备的电荷产生，各种不同的实验技术，在不同的条件下，结合一个全面的模型，在不同的时间尺度上发生的过程是必需的。我们提出了一个新的框架来研究有机光伏器件，其中一个模型，集成了器件物理与激发态动力学来解释瞬态和稳态光谱和光电测量。
Achieving the simultaneous increases in the open circuit voltage (Voc), short circuit current (Jsc) and fill factor (FF) necessary to further increase the power conversion efficiency (PCE) of organic photovoltaics (OPV) requires a unified understanding of how molecular and device parameters affect all three characteristics. In this contribution, we introduce a framework that for the first time combines different models that have been used separately to describe the different steps of the charge generation and collection processes in OPV devices: a semi-classical rate model for charge recombination processes in OPV devices, zero-dimensional kinetic models for the photogeneration process and exciton dissociation and one-dimensional semiconductor device models. Using this unified multi-scale model in conjunction with experimental techniques (time-resolved absorption spectroscopy, steady-state and transient optoelectronic measurements) that probe the various steps involved in charge generation we can shed light on how the energy offsets in a series of polymer: non-fullerene devices affect the charge carrier generation, collection, and recombination properties of the devices. We find that changing the energy levels of the donor significantly affects not only the transition rates between local-exciton (LE) and charge-transfer (CT) states, but also significantly changes the transition rates between CT and charge-separated (CS) states, challenging the commonly accepted picture of charge generation and recombination. These results show that in order to obtain an accurate picture of charge generation in OPV devices, a variety of different experimental techniques under different conditions in conjunction with a comprehensive model of processes occurring at different time-scales are required. We present a new framework to study organic photovoltaic devices in which a model that integrates device physics with excited state dynamics is applied to explain transient and steady-state spectroscopic and optoelectronic measurements.
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影响因子：
56.7
作者：
Classen, Andrej;Chochos, Christos L.;Brabec, Christoph J.
通讯作者：
Brabec, Christoph J.
影响因子：
29.4
作者：
Kan, Bin;Zhang, Jiangbin;Chen, Yongsheng
通讯作者：
Chen, Yongsheng
影响因子：
16.6
作者：
Gasparini N;Camargo FVA;Frühwald S;Nagahara T;Classen A;Roland S;Wadsworth A;Gregoriou VG;Chochos CL;Neher D;Salvador M;Baran D;McCulloch I;Görling A;Lüer L;Cerullo G;Brabec CJ
通讯作者：
Brabec CJ
影响因子：
29.4
作者：
Fei, Zhuping;Eisner, Flurin D.;Heeney, Martin
通讯作者：
Heeney, Martin
影响因子：
56.7
作者：
Benduhn, Johannes;Tvingstedt, Kristofer;Vandewal, Koen
通讯作者：
Vandewal, Koen