Fine-Tuned Photoactive and Interconnection Layers for Achieving over 13% Efficiency in a Fullerene-Free Tandem Organic Solar Cell
Fine-Tuned Photoactive and Interconnection Layers for Achieving over 13% Efficiency in a Fullerene-Free Tandem Organic Solar Cell
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微调%20光活性%20和%20互连%20层%20for%20实现%20over%2013%%20效率%20in%20a%20无富勒烯%20Tandem%20有机%20太阳能%20Cell
DOI：
10.1021/jacs.7b01493
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发表时间：
2017-05-31
影响因子：
15
通讯作者：
Hou, Jianhui
中科院分区：
文献类型：
--
作者：
Cui, Yong;Yao, Huifeng;Hou, Jianhui
采用串联结构制备有机太阳能电池被认为是克服有机光伏材料光吸收光谱有限的有效方法。目前，最高效的串联OSCs是采用富勒烯衍生物作为受体制备的。在这项工作中，我们设计了一种新的非富勒烯受体，其光学带隙（E-g(opt)）为1.68 eV，用于前亚电池，并优化了E-g（opt）为1.36 eV的无富勒烯活性层的相分离形貌，用于后亚电池。这两个亚电池具有低的能量损失和高的外量子效率，它们的光响应光谱是互补的。此外，还制备了一种由ZnO与ph中性自掺杂导电聚合物PCP-Na组成的近红外高透光率互连层（ICL）。从高度优化的亚电池和ICL中，获得了平均功率转换效率（PCE）大于13%的无富勒烯串联OSCs
Fabricating organic solar cells (OSCs) with a tandem structure has been considered an effective method to overcome the limited light absorption spectra of organic photovoltaic materials. Currently, the most efficient tandem OSCs are fabricated by adopting fullerene derivatives as acceptors. In this work, we designed a new non-fullerene acceptor with an optical band gap (E-g(opt)) of 1.68 eV for the front subcells and optimized the phase-separation morphology of a fullerene-free active layer with an E-g(opt) of 1.36 eV to fabricate the rear subcell. The two subcells show a low energy loss and high external quantum efficiency, and their photoresponse spectra are complementary. In addition, an interconnection layer (ICL) composed of ZnO and a pH-neutral self-doped conductive polymer, PCP-Na, with high light transmittance in the near-IR range was developed. From the highly optimized subcells and ICL, solution-processed fullerene-free tandem OSCs with an average power conversion efficiency (PCE) greater than 13% were obtained