Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan.
Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 30013, Taiwan.
ChemSusChem. 2018 Jan 23;11(2):415-423. doi: 10.1002/cssc.201701827. Epub 2017 Dec 12.
Here, we introduced benzo[ghi]perylenetriimide (BPTI) derivatives including monomer and twisted dimer (t-BPTI) as an alternative electron-transport layer (ETL) material to replace the commonly used PC BM in inverted planar heterojunction perovskite solar cells (PSCs). Moreover, the double ETL was applied in our PSCs with structure of glass/ITO/PEDOT:PSS/perovskite/BPTI/C or PDI-C4/BCP/Al. The use of a double ETL structure can effectively eliminate the leakage current. The devices with the t-BPTI/C double ETL yield an average power conversion efficiency of 10.73 % and a maximum efficiency of 11.63 %. The device based on the complete non-fullerene electron acceptors of t-BPTI/PDI-C4 as double ETL achieved maximum efficiency of 10.0 %. Moreover, it was found that the utilization of alloy t-BPTI+BPTI as ETL can effectively reduce the hysteresis effect of PSCs. The results suggest that BPTI-based electron-transport materials are potential alternatives for widely used fullerene acceptors in PSCs.
在这里，我们引入了苯并[ghi]苝三酰亚胺（BPTI）衍生物，包括单体和扭曲二聚体（t-BPTI），作为一种替代电子传输层（ETL）材料，以取代倒置平面异质结钙钛矿太阳能电池（PSCs）中常用的 PC BM。此外，我们在结构为玻璃/ITO/PEDOT:PSS/钙钛矿/BPTI/C 或 PDI-C4/BCP/Al 的 PSCs 中应用了双 ETL。使用双 ETL 结构可以有效消除漏电流。具有 t-BPTI/C 双 ETL 的器件的平均功率转换效率为 10.73%，最大效率为 11.63%。基于 t-BPTI/PDI-C4 作为双 ETL 的完全非富勒烯电子受体的器件实现了 10.0%的最大效率。此外，还发现使用合金 t-BPTI+BPTI 作为 ETL 可以有效降低 PSCs 的滞后效应。结果表明，基于 BPTI 的电子传输材料是 PSCs 中广泛使用的富勒烯受体的潜在替代品。
