Abstract
Lead-free double perovskites have been considered as a potential environmentally friendly photovoltaic material for substituting the hybrid lead halide perovskites due to their high stability and nontoxicity. Here, lead-free double perovskite Cs2AgBiBr6 films are initially fabricated by single-source evaporation deposition under high vacuum condition. X-ray diffraction and scanning electron microscopy characterization show that the high crystallinity, flat, and pinhole-free double perovskite Cs2AgBiBr6 films were obtained after post-annealing at 300 °C for 15 min. By changing the annealing temperature, annealing time, and film thickness, perovskite Cs2AgBiBr6 solar cells with planar heterojunction structure of FTO/TiO2/Cs2AgBiBr6/Spiro-OMeTAD/Ag achieve an encouraging power conversion efficiency of 0.70%. Our preliminary work opens a feasible approach for preparing high-quality double perovskite Cs2AgBiBr6 films wielding considerable potential for photovoltaic application.
Highlights
Organic–inorganic hybrid lead halide perovskite material family for photovoltaic application has attracted considerable attention in the past few years due to its excellent optoelectronic properties [1,2]
From the PL spectra of Cs2AgBiBr6 films with different annealing temperatures (Figure 3b), we found that only two thin films annealed at 250 °C and 300 °C feature a wide typical PL peak located at approximately 638 nm (1.94 eV) and the PL peak of the thin film annealed at 150 °C is not obvious, which indicated that the post-annealing process with more than annealing temperature of reported results [21]
We demonstrate the double perovskite solar cells with Cs2AgBiBr6 films that were initially prepared by single-source evaporation deposition
Summary
Organic–inorganic hybrid lead halide perovskite material family for photovoltaic application has attracted considerable attention in the past few years due to its excellent optoelectronic properties [1,2]. The novel inorganic double perovskite material (Cs2AgBiX6 (X = Cl, Br)) has drawn research attention due to their high stability and nontoxicity, and their single crystal with highly symmetric cubic structure has been synthesized in succession [11,12,13] This newly discovered double perovskite, especially the Cs2AgBiBr6, has been theoretically and experimentally tested to be a potential candidate for photovoltaic application due to their advantages of long carrier recombination lifetime, low toxicity, and high stability [5,14,15,16,17]. The materials to be deposited is placed on a metal heater, and rapidly evaporated onto the substrates by adjusting the heating current Through this simple method, the Cs2AgBiBr6 films have the advantages of good smoothness, high uniformity, and high crystallinity. By adjusting the annealing conditions and film thickness, the Cs2AgBiBr6 solar cell devices show an optimized PCE of approximately 0.70%
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