Surpassing the 10% efficiency milestone for 1-cm2 all-polymer solar cells
Surpassing the 10% efficiency milestone for 1-cm2 all-polymer solar cells
复制标题
超越%20%2010%%20效率%20里程碑%20%201-cm(2)%20全聚合物%20太阳能%20电池
DOI：
10.1038/s41467-019-12132-6
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发表时间：
2019-09-10
影响因子：
16.6
通讯作者：
Cao, Yong
中科院分区：
文献类型：
--
作者：
Fan, Baobing;Zhong, Wenkai;Cao, Yong
基于萘二酰亚胺的n型聚合物半导体被广泛用于构建高性能全聚合物太阳能电池（all-PSC）。对于这样的全聚合物系统，可以通过使用更薄的活性层来减少电荷复合，但遭受来自聚合物受体的不足的近红外光捕获。相反，增加层厚度克服了光收集问题，但以严重的电荷复合效应为代价。在这里，我们证明，管理所有PSC内的光传播，需要约350 nm的厚体异质结膜，以有效地提高近红外区域的光捕获。为了克服这种厚膜中严重的电荷复合，使用非卤素添加剂来诱导有序的微观结构，其固有地抑制复合损失。光管理和精细形态优化的组合策略导致活性面积为1 cm（2）的厚膜全PSC的效率超过10%，为全PSC的未来大规模生产和应用展示了巨大的前景。
Naphthalenediimide-based n-type polymeric semiconductors are extensively used for constructing high-performance all-polymer solar cells (all-PSCs). For such all-polymer systems, charge recombination can be reduced by using thinner active layers, yet suffering insufficient near-infrared light harvesting from the polymeric acceptor. Conversely, increasing the layer thickness overcomes the light harvesting issue, but at the cost of severe charge recombination effects. Here we demonstrate that to manage light propagation within all-PSCs, a thick bulk-heterojunction film of approximately 350 nm is needed to effectively enhance photo-harvesting in the near-infrared region. To overcome the severe charge recombination in such a thick film, a non-halogenic additive is used to induce a well-ordered micro-structure that inherently suppresses recombination loss. The combined strategies of light management and delicate morphology optimization lead to a promising efficiency over 10% for thick-film all-PSCs with active area of 1 cm(2), showing great promise for future large-scale production and application of all-PSCs.