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

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.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
back contact; cathode interface; device engineering; device stability; perovskite solar cells; solar cell efficiency

Yuan, MengShanghai Jiao Tong Univ, Peoples R China (författare)
Yang, JianmingEast China Normal Univ, Peoples R China (författare)
Song, JingnanShanghai Jiao Tong Univ, Peoples R China (författare)
Guo, XuewenEast China Normal Univ, Peoples R China (författare)
Li, XiangEast China Normal Univ, Peoples R China (författare)
Li, BoEast China Normal Univ, Peoples R China (författare)
Liu, XianjieLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)xiali21 (författare)
Duan, ChungangEast China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China (författare)
Liu, FengShanghai Jiao Tong Univ, Peoples R China (författare)
Fahlman, MatsLinköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten(Swepub:liu)matfa21 (författare)
Bao, QinyeEast China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China (författare)
East China Normal Univ, Peoples R ChinaShanghai Jiao Tong Univ, Peoples R China (creator_code:org_t)

Ingår i:Advanced Optical Materials: WILEY-V C H VERLAG GMBH7:192162-75682195-1071

Av författaren/redakt...: Xiong, Shaobing; Yuan, Meng; Yang, Jianming; Song, Jingnan; Guo, Xuewen; Li, Xiang; visa fler...; Li, Bo; Liu, Xianjie; Duan, Chungang; Liu, Feng; Fahlman, Mats; Bao, Qinye; visa färre...

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