Development of MAPbI₃.H₂O and MAPbI₃ perovskite solar cells using TiO₂ and P3HT as charge transport layers

MAPbI₃.H₂O and MAPbI₃ perovskite based solar cells were investigated using TiO₂ and P3HT as charge transport layers at ambient conditions. The transparent conducting oxide, fluorine doped tin oxide, coated glass slide serves as substrate during the cell fabrication process. Spin coating technique was employed to fabricate the cells with compact TiO₂ (c-TiO₂) and mesoporous TiO₂ (m-TiO₂) stack as an electron transport layer and P3HT as a hole transport layer. The structures of MAPbI₃.H₂O and MAPbI₃ perovskites were studied by single crystal XRD which confirms that the prepared crystals belong to tetragonal and monoclinic systems respectively. The layer properties of c-TiO₂ and m-TiO₂ were studied by powder XRD and FESEM analysis. Well defined sharp photoluminescence peaks of MAPbI₃.H₂O and MAPbI₃ perovskites observed at 840 and 781 nm respectively confirm direct band gap nature of the materials. Solar cells were successfully fabricated with controlled growth rate of the various layers. The FESEM cross-section provides information regarding the thickness of each layer in the cell. The dark J–V characteristics of the prepared cells were evaluated as proof of the concept.