Polyamino acid interlayer facilitates electron extraction in narrow band gap fullerene-free organic solar cells with an outstanding short-circuit current
Polyamino acid interlayer facilitates electron extraction in narrow band gap fullerene-free organic solar cells with an outstanding short-circuit current
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聚氨基酸中间层有利于窄带隙无富勒烯有机太阳能电池中的电子提取，具有出色的短路电流
DOI：
10.1016/j.nanoen.2018.05.034
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发表时间：
2018
期刊：
影响因子：
17.6
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Zheng Zhong;Zhou Huiqiong;Tang Zhiyong;Yao Huifeng;Hou Jianhui;Tang Zhiyong;Wang Rong;Xie Shenkun;Zhang Yuan;Tang Zhiyong;Zhou HQ;Hou JH;Zhang Y
在这篇论文中，我们研究了由多氨基酸α-聚-L-赖氨酸(α-PLL)组成的电子提取层(EEL)对基于窄能隙PtB7-Th：IEICO-4异质结的无富勒烯有机太阳能电池的界面特性的调制。得益于α-PLL EEL的有效界面修饰，PtB7-Th：IEICO-4F太阳能电池的短路电流(26.6cA/ )显著提高，最终功率转换效率超过12%，这是改进电荷提取的结果。结合电子自旋共振光谱、角分辨X射线光电子能谱和电荷输运测量，我们发现界面掺杂发生在α-PLL/IEICO-4F界面，这可能是由于α-PLL中裸露的伯胺和非共轭主链的低空间位阻所致。与α-PLL的接口策略具有普遍的适用性，能够产生一系列具有不同器件架构的高效PCBM或非富勒烯OSC。这项工作丰富了对关键界面过程的基本见解，并提供了一条利用可广泛访问的生物材料获得高性能OSCs的途径，该材料采用新兴的不含富勒烯的光伏材料。
In this communication, we present a study to investigate interfacial characteristics modulated by electron extraction layers (EEL) comprising of a polyamino acid α-poly-L-lysine (α-PLL) in fullerene-free organic solar cells (OSC) based on narrow-band-gap PTB7-Th:IEICO-4 heterojunctions. Benefitting from effective interfacial modifications with the α-PLL EEL, PTB7-Th:IEICO-4F solar cells receive a considerable boost in the short-circuit current (26.6 mA/cm2) and ultimate power conversion efficiencies exceeding 12%, which is a result of promoted charge extraction. Aided by combinatorial analyses using electron spin resonance spectroscopy, angle-resolved X-ray photoelectron spectroscopy together with charge transport measurements, we found that the interfacial doping occurs at the α-PLL/IEICO-4F interface, possibly due to the low steric hindrance of the bared primary amines and non-conjugated backbones in α-PLL. The interface strategy with α-PLL displays a universal applicability, enabling to produce a series of high efficiency PCBM or non-fullerene OSCs with different device architectures. This work enriches fundamental insights into key interfacial processes and provides a promising pathway utilizing wide-accessible biomaterials to attain high performance OSCs with emerging fullerene-free photovoltaic materials.