Carrier collection and light absorption is a couple of contradiction for polymer solar cells (PSCs) because of the limited carrier mobility and optical absorption coefficient for the organic active layers. In this article, the concept of “bridging for carriers” is introduced by embedding metal oxide (ZnO for electrons and NiOx for holes in this study) nanoparticles into the photoactive layer of PSCs to improve exciton separation, enhance carrier transport, reduce electron–hole recombination and thus facilitate carrier collection. It is found that ∼57.6% increase in the power conversion efficiency, i.e., from 1.98% to 3.12% for the optimal addition of ZnO and NiOx into the active layer of the P3HT:PC61BM blend is achieved as compared with the control case without adding ZnO and NiOx nanoparticles. In combination with the simple hydrothermal method of preparing these metal oxide nanoparticles, this study is believed to provide valuable contribution to explore facile approaches to address the contradiction of carrier collection and light absorption for PSCs by bridging for carriers in the photoactive layer.

中文翻译：

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通过在光敏层中嵌入金属氧化物纳米颗粒来桥接载体以提高聚合物太阳能电池的性能

由于有机活性层的载流子迁移率和光吸收系数有限，载流子收集和光吸收是聚合物太阳能电池（PSC）的一对矛盾。在本文中，通过将金属氧化物（本研究中为 ZnO 为电子，NiOx 为空穴）纳米粒子嵌入 PSC 的光敏层中，引入了“载流子桥接”的概念，以改善激子分离，增强载流子传输，减少电子空穴重组，从而促进载体收集。发现与未添加的对照情况相比，将 ZnO 和 NiOx 最佳添加到 P3HT:PC61BM 共混物的活性层中，功率转换效率提高了约 57.6%，即从 1.98% 增加到 3.12% ZnO 和 NiOx 纳米颗粒。