首页|Achieving one-step solution deposition of high quality CsPbBr3 films for efficient solar cells through halide ion exchange
Achieving one-step solution deposition of high quality CsPbBr3 films for efficient solar cells through halide ion exchange
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NSTL
Elsevier
? 2022CsPbBr3 perovskite solar cell (PSC) has triggered an increasing interest owing to its high tolerance to thermal and humidity in the open air. The one-step method is preferable for preparing high-quality CsPbBr3 films and thereby highly efficient PSCs. However, the poor solubility of CsBr in common solvents makes it a big challenge to prepare desired CsPbBr3 films using the traditional one-step method. Therefore, researchers have to employ a two-step method to prepare CsPbBr3 films for PSCs. Actually, the one-step solution processed perovskite films is more attractive owing to its compatible advantages to existing large-scale technology. Therefore, it is crucial to develop a one-step method to prepare high-quality CsPbBr3 films. Here, we propose a one-step solution approach to prepare CsPbBr3 films through halide exchange. In this approach, a PbBr2-CsI-DMSO intermediate film is firstly prepared by spin-coating CsPbIBr2/DMSO solution (1.0 M), followed by dropping hydrogen bromide/acetic acid (HBr/HAc) solution while spinning, and subsequently realize the halide ion exchange between Br- and I-, which separately comes from HBr and PbBr2-CsI-DMSO. After completing the halide ions exchange, it forms a new complex of PbBr2-CsBr-DMSO, and eventually converts to CsPbBr3 films through annealing treatment. As a result, high-quality CsPbBr3 films with a thickness of ~260 nm are obtained due to the appropriate concentration of CsPbIBr2/DMSO solution in the initial step. After integrating into an HTL-free carbon-based PSC, it delivers much higher efficiency than that prepared by the traditional one-step method. This work provides a new one-step preparation method for CsPbBr3 films, making it has attractive applications in CsPbBr3-based devices.
NSTL
Elsevier
