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This research demonstrates a complete solution prepared environment-friendly high-performance solid-state BiOI photovoltaic cell with high-short-circuit current for the first time. All the layers have been prepared at room temperature in the atmosphere without using the vacuum process. The photovoltaic properties are improved with employing both electron transport layer (ETL) and hole transport layer (HTL) and with increasing the cycle number of the SILAR process up to 30 cycles where the maximum short-circuit current density, J SC = 7.6 mA/cm 2 and the open-circuit voltage, V OC = 0.63 V, respectively. The ETL and HTL effects on the photovoltaic properties are discussed together with absorption spectrum and external quantum efficiency.

Bismuth oxyhalides are becoming a promising contender for photovoltaic applications due to its non-toxic nature and decent optical properties. This study mainly deals with clarifying the effects of phase transformations on the structure, optical, and electrical properties of BiOI thin film prepared via dip-successive ionic layer adsorption and reaction (SILAR) method at different annealing temperatures ranging from 100 to 400 °C. Therefore, significant phase transformations (i.e., the existence of Bi7O9I3 and Bi5O7I have been confirmed at 300 °C and 400 °C, respectively) appeared in the produced films, which were mainly due to the change of annealing temperatures. The experimental results confirmed that produced films achieved the maximum current density and efficiency and minimum current density and efficiency at 100 °C and 400 °C, respectively. Experimental results were also showed that with increasing the annealing temperature from 100 to 400 °C, the indirect bandgap risen from 1.77 to 2.96 eV while the crystallite size decreased from 17.62 to 12.99 nm. The energy band diagram with electrolyte explained the observed poor electrical properties during the phase transformation. Hence, this result will add positive impacts on the new information on findings for the dip-SILAR-prepared BiOI photovoltaic cells.