11.2% All-Polymer Tandem Solar Cells with Simultaneously Improved Efficiency and Stability
11.2% All-Polymer Tandem Solar Cells with Simultaneously Improved Efficiency and Stability
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11.2%%20全聚合物%20串联%20太阳能%20电池%20与%20同时%20提高%20效率%20和%20稳定性
DOI：
10.1002/adma.201803166
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发表时间：
2018
影响因子：
29.4
通讯作者：
Cao Yong
中科院分区：
文献类型：
--
作者：
Zhang Kai;Xia Ruoxi;Fan Baobing;Liu Xiang;Wang Zhenfeng;Dong Sheng;Yip Hin-Lap;Ying Lei;Huang Fei;Cao Yong
含有共混在一起作为光吸收层的p型和n型聚合物材料的全聚合物太阳能电池（全PSC）引起了人们的广泛关注，因为聚合物供体和受体的共混物应该呈现出比小分子有机太阳能电池更上级的光化学、热和机械稳定性。在这项工作中，通过使用高度稳定的全聚合物太阳能电池作为平台来研究界面稳定性。研究发现，在器件存储过程中，热沉积的金属电极原子会扩散到有源层中，从而大大降低了功率转换效率。幸运的是，金属原子的扩散可以通过使用较厚的夹层材料、高玻璃化转变温度的夹层材料或串联器件结构来减缓甚至阻止。以此为基础，成功开发出同质结串联全PSC，其功率转换效率超过11%，并且在80 °C热老化1000 h后，效率仍保持初始值的93%。
All‐polymer solar cells (all‐PSCs) that contain both p‐type and n‐type polymeric materials blended together as light‐absorption layers have attracted much attention, since the blend of a polymeric donor and acceptor should present superior photochemical, thermal, and mechanical stability to those of small molecular‐based organic solar cells. In this work, the interfacial stability is studied by using highly stable all‐polymer solar cell as a platform. It is found that the thermally deposited metal electrode atoms can diffuse into the active layer during device storage, which consequently greatly decreases the power conversion efficiency. Fortunately, the diffusion of metal atoms can be slowed down and even blocked by using thicker interlayer materials, high‐glass‐transition‐temperature interlayer materials, or a tandem device structure. Learning from this, homojunction tandem all‐PSCs are successfully developed that simultaneously exhibit a record power conversion efficiency over 11% and remarkable stability with efficiency retaining 93% of the initial value after thermally aging at 80 °C for 1000 h.