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完全非化电子接受器太阳能电池通过协同的外围替代品战略获得18%的效率

Yeye Wang^1,2, Mingqun Yang^1,2, Zhili Chen^1,2,3

¹Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, PR China.

Nature communications

|July 2, 2025

概括

为有机太阳能电池 (OSC) 开发了全新的非化环电子受体 (FNEA),实现了创纪录的18.04%的功率转换效率. 这一突破缩小了FNEA和化环接受器之间的差距,为低成本,高性能设备铺平了道路.

科学领域:

材料科学材料科学材料科学
有机电子有机电子
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) 的商业化需要高效,低成本的光活性材料.
完全非化环电子受体 (FNEAs) 的合成成本较低,但由于晶体性和形态不佳,其功率转换效率 (PCEs) 较低.
现有的FNEA在实现纳米尺度相位分离以实现高效的电荷传输方面面临着挑战.

研究的目的:

为高性能OSC设计和合成具有改善晶度和形态的新型FNEAs.
研究合理分子设计,特别是外围替代剂对FNEA特性的影响.
为了缩小FNEA和传统的化环电子接受器之间的效率差距.

主要方法:

通过修改外围替代品,合理设计四个FNEAs (NEH-4F,EEH-4F,NBO-4F,EBO-4F).
中心核心的封装以增强平面性和结晶性.
延长外侧链以调节分子堆叠和与聚合物供体PTTz.的热力学兼容性.
使用开发的FNEAs进行OSC的制造和表征.

主要成果:

设计的FNEA,特别是EBO-4F,证明了接受器结晶度的改善.
该PTTz:EBO-4F混合物表现出纳米级相分离与纤维状双连续互穿网络形态.
这种优化的形态促进了高效的激子扩散和电荷传输.
在使用新型FNEA的OSC中实现了创纪录的PCE18.04%.

结论:

FNEA的合理分子设计,专注于核心封装和侧链工程,可以克服结晶性和形态学的局限性.
开发的FNEAs显示出制造高效的OSC的巨大潜力.
这项工作大大缩小了FNEA和化环接受器之间的效率差距,突出了低成本FNEA材料的前景.

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