Engineering of the Back Contact between PCBM and Metal Electrode for Planar Perovskite Solar Cells with Enhanced Efficiency and Stability

Liu, Xianjie (author): Linköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten

Duan, Chungang (author): East China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China

Fahlman, Mats (author): Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten

Bao, Qinye (author): East China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China

(creator_code:org_t)

2019-06-27
2019
English.
In: Advanced Optical Materials. - : WILEY-V C H VERLAG GMBH. - 2162-7568 .- 2195-1071. ; 7:19

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

The cathode interface plays a critical role in achieving high-performance fullerene/perovskite planar solar cells. Herein, the simple molecule Isatin and its derivatives are introduced at the back contact [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/Al as a cathode modification interlayer. It is revealed that the Isatin interlayers facilitate electron transport/extraction and suppress electron recombination, attributed to the formation of negative dipole potential steps and the passivation of the interfacial trap density. The average power conversion efficiencies of the resulting devices are significantly improved by 11% from 17.68% to 19.74%, with an enhancement in all device parameters including short-circuit current, open-circuit voltage, and fill factor. The hysteresis index is found to disappear. In addition, such interlayer enhances device stability under ambient conditions compared to the control devices due to suppression of moisture-induced degradation of the perovskite films. These findings provide a comprehensive understanding of the engineering of the back contact between PCBM and the metal electrode to improve efficiency and stability of perovskite solar cells.

By the author/editor: Xiong, Shaobing; Yuan, Meng; Yang, Jianming; Song, Jingnan; Guo, Xuewen; Li, Xiang; show more...; Li, Bo; Liu, Xianjie; Duan, Chungang; Liu, Feng; Fahlman, Mats; Bao, Qinye; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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