A modified sequential deposition method for fabrication of perovskite solar cells. (March 2016)

• Record Type: Journal Article
• Authors: Li, Hangqian; Li, Shibin; Wang, Yafei; Sarvari, Hojjatollah; Zhang, Peng; Wang, Meijuan; Chen, Zhi
• Is Part Of: Solar energy. Volume 126(2016)
• Page Start: 243
• Page End: 251
• Publication Date: 2016-03
• Subjects: Perovskite solar cell -- Capping layer -- Pre-coating -- Modified sequential deposition; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2015.12.045
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: A modified sequential deposition to prepare perovskite solar cell is proposed. The high-coverage of perovskite crystallites in the capping layer is obtained. The performance of PSCs is improved by compact capping layer. Abstract: In this paper, the important role of perovskites capping layers in the compact-TiO2 /mesoporous-TiO2 /CH3 NH3 PbI3 /HTM/Au solar cells was investigated. The capping layers were prepared by controlling the concentration of PbI2 solutions, pre-coating in CH3 NH3 I solution, the reaction temperature, and the dipping time in the sequential deposition process. The results of X-ray diffraction (XRD) spectra revealed that there was no PbI2 remains observed in the perovskite crystal structure, indicating that PbI2 was converted into CH3 NH3 PbI3 completely. The morphologies of the capping layers are studied by scanning electron microscopy (SEM). Furthermore, organic–inorganic hybrid perovskite solar cells fabricated using the continuous and compact perovskite capping layers exhibit power conversion efficiency of 12.9% and photocurrents up to 19.4 mA cm −2 .