Ternary non-fullerene polymer solar cells with an efficiency of 11.6% by simultaneously optimizing photon harvesting and phase separation
Ternary non-fullerene polymer solar cells with an efficiency of 11.6% by simultaneously optimizing photon harvesting and phase separation
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三元%20非富勒烯%20聚合物%20太阳能%20细胞%20with%20an%20效率%20of%2011.6%%20by%20同时%20优化%20光子%20收获%20和%20相%20分离
DOI：
10.1039/c8ta03453b
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发表时间：
2018-06
影响因子：
11.9
通讯作者：
Zhang Fujun
中科院分区：
文献类型：
--
作者：
Wang Jianxiao;Gao Wei;An Qiaoshi;Zhang Miao;Ma Xiaoling;Hu Zhenghao;Zhang Jian;Yang Chuluo;Zhang Fujun
以J71为施主，ITIC：MeIC 2为受主，制备了三元非富勒烯聚合物太阳能电池（PSC）。当MeIC 2的质量分数为20%时，三元PSC的功率转换效率（PCE）达到11.6%，高于ITIC或MeIC 2作为受主的二元PSC的10.7%或10.2%。三元PSC的PCE改善主要归因于同时增强的18.1 mA cm−2的短路电流密度（JSC）和70.5%的填充因子（FF）。由于ITIC和MeIC 2的互补吸附，可以通过调节MeIC 2含量来优化三元有源层的光子捕获，从而导致增强的JSC。同时，三元有源层的相分离可以进一步优化，以实现有效的激子解离和更平衡的电荷输运。改进的FF可以很好地解释从更平衡的电荷输运评价的空穴迁移率的比率，在有源层中的电子迁移率。
Ternary non-fullerene polymer solar cells (PSCs) were fabricated with J71 as a donor and mixed ITIC:MeIC2 as acceptors. The power conversion efficiency (PCE) of the ternary PSCs reaches 11.6% for 20 wt% MeIC2 in the acceptors, which is larger than the 10.7% or 10.2% for binary PSCs with ITIC or MeIC2 as an acceptor. The PCE improvement of ternary PSCs is mainly attributed to the simultaneously enhanced short circuit current density (JSC) of 18.1 mA cm−2 and fill factor (FF) of 70.5%. The photon harvesting of ternary active layers can be optimized by adjusting MeIC2 content due to the complementary asborption of ITIC and MeIC2, leading to the enhanced JSC. Meanwhile, phase separation of ternary active layers can be further optimized for efficient exciton dissociation and more balanced charge transport. The improved FF can be well explained from the more balanced charge transport evaluated by the ratios of hole mobility to electron mobility in the active layers.
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