4 years ago

Multiple electron transporting layers and their excellent properties based on organic solar cell

Yixing Yang, Weiran Cao, Changfeng Han, Yuanyuan Cheng, Ting Zhang, Song Chen, Jingyu Li, Lei Qian, Ziyan Yang, Wei Xue
To improve the performance of inverted polymer solar cells based on a ternary blend of polymerthieno [3,4-b] thiophene/benzodithiophene (PTB7), [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) and indene-C60-bisadduct (ICBA), a two-layer structure of zinc oxide (ZnO) and Al-doped zinc oxide (AZO) nanoperticles is used to improve electron extraction. Comparing to ZnO, AZO has lower work function and thus provides larger built-in potential across the organic heterojunction, resulting in more efficient photo-current extraction and larger open circuit voltages. Optimum devices with ZnO/AZO nanoparticles show enhancement of both short circuit current and open circuit voltage, leading to a power conversion efficiency (PCE) of 8.85%. The argument of energy level buffering and surface morphology is discussed in the paper. Finally, using a trilayer electron transporting unit of ZnO/AZO/PFN, the interface dipole between the organic active layer and AZO is introduced. The PCE is further enhanced to 9.17%.

Publisher URL: https://www.nature.com/articles/s41598-017-08613-7

DOI: 10.1038/s41598-017-08613-7

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