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在有机太阳能电池中减少电压损失的降低激子解离率

Hongbo Wu¹, Hao Lu², Yungui Li³

¹State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, PR China.

Nature communications

|March 28, 2024

概括

研究人员发现,降低单元状态解离速率常数 (k_DS) 会提高有机太阳能电池 (OSC) 中的电解发光量子效率 (EQE_EL). 这一发现提供了一个新的策略,通过解决非辐射电压损失来提高设备性能.

科学领域:

有机电子学有机电子学
太阳能光伏发电是如何实现的
材料科学是一种材料科学.

背景情况:

设备电解发光量子效率 (EQE) 对有机太阳能电池 (OSC) 至关重要,但当前的高效设备显示EQE限制在10%-2%以下.
专注于电荷转移 (CT) 状态动态的传统方法并没有显著改善EQE,落后于无机设备.
非辐射电压损失 (V_NR) 仍然是OSC性能的一个关键挑战.

研究的目的:

为了研究单元状态解离速率常数 (k_DS) 对OSC中EQE_EL的影响.
挑战对影响EQE_EL的因素的传统理解.
通过操纵k_DS.提出一种新的战略,以提高OSC的绩效.

主要方法:

在OSC中对单元状态解离动态的实验调查.
将k_DS与EQE_EL以及光伏量子效率 (EQE_PV) 相对应.
在受控的k_DS变化下对设备性能进行表征.

主要成果:

与之前的假设相反,EQE_EL受到k_DS的显著影响.
对k_DS进行控制的降低可以提高EQE_EL.
这种k_DS的减少可以改善EQE_EL而不会对EQE_PV产生负面影响.

结论:

单元状态的分离速率常数 (k_DS) 是OSC中EQE_EL的一个关键,但被忽视的参数.
减少k_DS提供了一个可行的策略,以提高EQE_EL和减轻V_NR.
这项工作为推进OSC技术提供了一个有希望的实验方法.

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