Enhancement of The Photovoltaic Performance of CH3NH3PbI3 Perovskite Solar Cells by Using Polyvinylpyrrolidone Additive

Jian-feng, 李建丰 Li; Chuang, 赵创 Zhao; Heng, 张恒 Zhang; Jun-feng, 同军锋 Tong; Peng, 张鹏 Zhang; Chunyan, 杨春燕 Yang; Yang-jun, 夏养君 Xia

doi:10.3788/fgxb20163701.0056

Cited by 1 publication

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“…The lower Rs in acetate PSC device is also connected with the enhanced n-type property of acetate ETL than that in carbonate ETL. Higher Rsh value in acetate also conforms to the two-times reduced leakage current J0 [31] compared to carbonate device (Fig. 3(C)).…”

Section: Device Performancesupporting

confidence: 74%

Low temperature processed efficient and stable perovskite solar cell

Uddin¹,

Mahmud²,

Elumalai³

et al. 2019

Adv. Mater. Lett.

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MA0.6FA0.4PbI3 material based efficient and stable perovskite solar cells (PSCs) are fabricated by electron transport layer (ETL) interfacial modification. The highest power conversion efficiency (PCE) of device was ~ 17%. Cesium acetate and cesium carbonate were used with low temperature processed sol-gel ZnO ETL for interface modifications. Low leakage current and enhanced dark injection current are observed from dark currentvoltage measurement. From the electrochemical impedance spectroscopy (EIS) measurement higher recombination resistance and lower interfacial contact resistance are observed in the PSC devices. Mott-Schottky analysis also shows the higher flat-band potential and enhanced device performance with cesium acetate ETL. Cesium acetate related ZnO ETL has large grain size which leads to reduce the device series resistance and contact resistance in PSC compared to cesium carbonate ETL related device. Perovskite film on cesium acetate ETL has better surface morphology, topography and hydrophobicity characterization compared to perovskite film grown on cesium carbonate ETL film. The material work function and electron injection barrier are also investigated by X-Ray photoelectron spectroscopy (XPS) measurement and ultraviolet photoelectron spectroscopy (UPS). From electrochemical impedance spectroscopy measurements the charge transport behaviour and trap-assisted carrier recombination are estimated. Fabricated PSCs device stability has been measured for a month-long degradation study. The PSC device stability is observed four times higher with cesium acetate PSCs compared to cesium carbonate ETL related PSCs. The overall device PCE is around 82% higher with cesium acetate compared to cesium carbonate devices.

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Section: Device Performancesupporting

confidence: 74%