Doping with SnBr₂ in CsPbBr₃ to enhance the efficiency of all-inorganic perovskite solar cells

Abstract

The good environmental stability of all-inorganic CsPbBr3 perovskite solar cells is crucial for the commercialization of perovskite solar cells.

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

“…This newly fabricated structure will possibly passivate defects, reducing the interfacial charges recombination and allowing photogenerated carriers to transport smoothly within devices after quasi core−shell technique treatment and there is no significant carrier trapping levels. Also, the doping technique [ 37 ] in CsPbBr 3 had been used to reduce the barrier between the interfaces to improve carrier transport efficiency. Further, when FAI concentration exceeds to 2 mg mL −1 (see device D), the performance of FAI‐treated photodetectors decline, and the reason is that the excess FAI remained in the film, in this way, excess cations in perovskite crystal increases nonradiative energy transfer to the trap‐states, thus affecting the performance negatively.…”

Improved phase stability of CsPbI2Br perovskite by released microstrain toward highly efficient and stable solar cells

“…Figure 2A shows the full spectra of BTEC‐2F, CsPbI 2 Br and CsPbI 2 Br/BTEC‐2F films. Compared with pristine CsPbI 2 Br, additional peaks of CsPbI 2 Br/BTEC‐2F film at 164.9, 284.8, and 687.4 eV are assigned to S 2s, C 1s, and F 1s, which prove the existence of BTEC‐2F on the inorganic perovskite layer 21 . Figure 2B–D shows the high‐resolution XPS spectra of the core levels of Pb(4f), O(1s), and S(2s).…”

Fabrication of single phase CsPbBr3 films via in situ metal reaction

“…30,31 40 nm Pb@CsPbBr 3 showed the highest emission intensity compared to 20 nm Pb@CsPbBr 3 and 60 nm Pb@CsPbBr 3 , which indicates that the 40 nm Pb@CsPbBr 3 films have the best photoelectric quality with the highest number of photogenerated carriers. 28,32,33 In other words, the 40 nm Pb@CsPbBr 3 films have the highest photo-generated carrier efficiency and less carrier recombination at defects. The transient surface photovoltage (TSPV) was measured to further study the photoinduced charge carrier dynamics of the CsPbBr 3 films, such as charge carrier lifetime and transfer, charge transport direction and semiconductor conductivity type.…”