Adjusting the energy of interfacial states in organic photovoltaics for maximum efficiency.
Adjusting the energy of interfacial states in organic photovoltaics for maximum efficiency.
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DOI：
10.1038/s41467-021-22032-3
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发表时间：
2021-03-19
影响因子：
16.6
通讯作者：
Brabec CJ
中科院分区：
文献类型：
--
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
提高有机太阳能电池（OSC）性能的一个关键瓶颈是通过形成混合能量态来最小化界面电荷转移（CT）态中的非辐射损失。这需要小的能量偏移，通常不利于高的外部量子效率（EQE）。在这里，我们获得了同时最小化非辐射电压损耗（0.24 V）和光电流损耗（EQE > 80%）的OSC。界面CT状态分离成自由载流子，时间常数为1.40-ps。我们结合联合收割机和光谱数据来模拟电荷分离和提取的热力学，揭示了装置的相对高的性能产生于CT状态能量的最佳调整，其决定了如何有效地使用可用的总驱动力来最大化激子分裂和电荷分离。所提出的模型是通用的施主：受主（D：A）与低驱动力和预测的D：A将受益于形态优化的高效OSC。了解有机光致变色材料中非辐射损失的机理对于进一步提高其性能至关重要。在这里，作者使用组合的设备和光谱数据来揭示通过调节电荷转移态的能量来最大化激子分裂和电荷分离的通用模型。
A critical bottleneck for improving the performance of organic solar cells (OSC) is minimising non-radiative losses in the interfacial charge-transfer (CT) state via the formation of hybrid energetic states. This requires small energetic offsets often detrimental for high external quantum efficiency (EQE). Here, we obtain OSC with both non-radiative voltage losses (0.24 V) and photocurrent losses (EQE > 80%) simultaneously minimised. The interfacial CT states separate into free carriers with ≈40-ps time constant. We combine device and spectroscopic data to model the thermodynamics of charge separation and extraction, revealing that the relatively high performance of the devices arises from an optimal adjustment of the CT state energy, which determines how the available overall driving force is efficiently used to maximize both exciton splitting and charge separation. The model proposed is universal for donor:acceptor (D:A) with low driving forces and predicts which D:A will benefit from a morphology optimization for highly efficient OSC. Understanding the mechanism of non-radiative losses in organic photovoltaics is crucial to improve the performance further. Here, the authors use combined device and spectroscopic data to reveal universal model to maximise exciton splitting and charge separation by adjusting the energy of charge transfer state.
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