Investigating the Sequential Deposition Route for Mixed Cation Mixed Halide Wide Bandgap Perovskite Absorber Layer

Energies

卷:14

Diego Pugliese¹  Nadia Shahzad²  Abdul Sattar²  Muhammad Ali Tariq²  Muneeza Ahmad² 

[1] INSTM Research Unit, Applied Science and Technology Department, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy;

[2] U.S.-Pakistan Center for Advanced Studies in Energy, National University of Sciences and Technology, H-12, Islamabad 44000, Pakistan;

关键词: perovskite;    sequential deposition;    wide bandgap;    absorber layer;    solar cells;   

DOI  :  10.3390/en14248401

来源: DOAJ

【 摘 要 】

Wide bandgap (E_g) perovskite solar cells (PSCs) are emerging as the preferred choice for top cells in a tandem architecture with crystalline silicon solar cells. Among the wide bandgap perovskites, a mixed cation mixed halide composition containing Cs_yFA_1-yPbI_3−xBr_x is a popular choice because the presence of bromine widens the bandgap and addition of cesium stabilizes the crystal structure. These perovskite layers are commonly fabricated using one-step spin coating technique; however, sequential spin coating followed by dip coating has been successful in offering better control over the crystallization process for low bandgap absorber layers. In this paper, the fabrication of a Cs_0.2FA_0.8PbI_3−xBr_x perovskite absorber layer using the sequential deposition route is reported. The concentration of bromine was varied in the range 0 ≤ x ≤ 1 and optical, structural, and morphological properties of the films were studied. As the concentration was increased, the perovskite showed better crystallinity and the presence of large grains with high surface roughness, indicating the formation of the CsPbBr₃ phase. Optically, the perovskite films exhibited higher absorbance in the ultraviolet (UV) range between 300 and 500 nm, hence up to x = 0.3 they can be profitably employed as a wide bandgap photon absorber layer in solar cell applications.

【 授权许可】

Unknown