In-situ Interfacial Passivation for Stable Perovskite Solar Cells

Frontiers in Materials

Liang Li¹  Huanping Zhou¹  Yizhou Zhao²  Guangyue Cao²  Xiuxiu Niu²  Longfan Duan²  Qi Chen²  Yang Bai² 

[1] College of Engineering, Peking University, Beijing, China;School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China;

关键词: dithiol;    stability;    interface;    perovskite solar cell;    efficiency;   

DOI  :  10.3389/fmats.2019.00200

来源: DOAJ

【 摘 要 】

Unreacted lead iodide is commonly believed playing an important role in the performance of perovskite solar cells (PSCs). However, the excess lead iodide acts like a double-edged blade, which hampers the long-term stability of devices. Here, we used the ethanedithiol (EDT) as the solvent to process Spiro-OMeTAD (Spiro) layer. Due to the strong coordination between EDT and Pb (II), the unreacted PbI2 at the perovskite films surface was effectively passivated, which suppressed the degradation of the perovskite layer without sacrificing the efficiency. Moreover, the hydrophobic EDT also enhanced the moisture stability of devices, thus prolonged the device lifetime. With EDT-Spiro layer, a stabilized power conversion efficiencies from 17.11% up to 19.23% was achieved in the corresponding device. More importantly, a significant enhancement of the long-term stability of PSCs was observed under the N2 atmosphere without sealing for 30 days.

【 授权许可】

Unknown