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高开放电路电压有机太阳能电池,效率为19.2%,通过协同侧链工程实现

Renjie Xu^1,2, Yuanyuan Jiang^1,2, Feng Liu^1,3

¹Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|March 28, 2024

概括

研究人员设计了一种新的非富勒林受体 (NFA),Z19,以克服有机太阳能电池 (OSC) 的局限性. 这一突破实现了创纪录的功率转换效率 (PCE) 19.2%,高开通电路电压 (V_OC) 超过1.0V.

科学领域:

有机电子学有机电子学
材料科学是一种材料科学.
太阳能光伏发电是如何实现的

背景情况:

有机太阳能电池 (OSC) 由于非辐射能量损失 (ΔE_nonrad),受到低开放电路电压 (V_OC) 的限制,阻碍了功率转换效率 (PCE).
在OSC中,V_OC和外部量子效率 (EQE) 之间存在一个权衡,PCE通常低于15%,V_OC超过1.0V.

研究的目的:

设计一种新型的非富勒烯受体 (NFA),最大限度地减少非辐射能量损失,并在OSC中增强V_OC.
研究NFA的电子特性和聚合行为,以提高OSC的性能.

主要方法:

设计了一个新的NFA,Z19,通过将alkoxy和phenyl替代的基链纳入结合的骨干.
分析了Z19的电子特性,包括它的吸收频谱和能量水平,以及它的聚合行为 (2D打包).
制造和表征D18:Z19混合膜,评估相位分离,分子方向和电荷传输.

主要成果:

Z19表现出低颜色转移的吸收光谱,一个高处的最低空置分子轨道 (LUMO) 能量水平,并订购了2D包装.
D18:Z19混合膜显示有利的相位分离和面对面的分子方向,导致增强的电荷传输.
D18:Z19设备实现了创纪录的PCE19.2%,高V_OC为1.002V,超过了基于Y6-2O的设备.
基于Z19的设备 (0.200 eV) 的ΔE_nonrad显著低于基于Y6的设备 (0.239 eV).

结论:

设计的NFA,Z19,有效减少非辐射能量损失,使高V_OC和PCE在OSCs.
同时考虑能量差距法和分子设计对于推进OSC技术至关重要.
这项工作为设计高性能NFA提供了新的策略,可能导致OSC的突破.

关键词:

分子聚合分子聚合.非富勒受体的非富勒受体.开放电路电压的开放电路电压.有机太阳能电池是有机太阳能电池.提高了功率转换效率,提高了功率转换效率.侧链工程侧链工程

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