In third‐generation solar cells, dye sensitized (DSCs) and perovskite (PSCs) both, the role of electron‐transport layers (ETLs) is to block hole transfer at fluorine‐doped tin oxide/mesoporous TiO2 interface, while efficiently transporting the electron at this interface. Conventional solution‐processed dense anatase TiO2 ETL is limited by its low electron mobility. WO3, despite having higher electron mobility and chemical stability, has seldom been used as ETL in DSCs/PSCs, owing to poor crystalline structure and interfacial charge transfer in ETLs prepared using existing methods. Herein this paper, ultrathin and uniform WO3 films of different crystalline structures, such as tetragonal (t‐), orthorhombic (o−), hexagonal (h−), and monoclinic (m−), prepared by scalable Langmuir–Blodgett method, are reported. The efficiency (η) of DSCs fabricated with ETL having high‐symmetry phases of WO3 (h‐WO3, o‐WO3, t‐WO3) is found to exceed the efficiency of devices having ETL of low‐symmetry WO3 phase (m‐WO3). Further, highest η ≈ 9.53%, tantamount to an improvement of 13%, is found in DSCs fabricated with ETL having a mixed phase of o‐ and t‐WO3 and surpassed η of devices based on TiO2 ETLs (8.4%). Herein, the role of structure/phase of WO3 ETLs toward enhancing device performance and outperforming the conventional TiO2 ETLs‐based DSCs is highlighted.
Organic inorganic-based perovskites solar cells (PSCs) are quite prominent as next generation solar cells as they exhibit excellent properties as well as high power conversion efficiency. In spite of the high cost, interfacial recombinations and instability in ambient environment limit their commercialization. Herein, TiO2-based compact layer (c-TiO2) with different thicknesses is employed (<50[Formula: see text]nm) to study the charge transportation at interface and recombination in PSCs fabricated under high humid conditions (R[Formula: see text] 80%). The thickness of CL was varied from 7[Formula: see text]nm to 35[Formula: see text]nm and was optimized by changing the precursor concentration as well as spinning speed. The prepared c-TiO2 and the mesoporous layer of TiO2 (m-TiO2) were thoroughly characterized using Raman spectroscopy, UV-Vis, cyclic voltammetry and electrochemical techniques. Furthermore, CuSCN was used as hole transporting layer (HTL) in PSCs owing to ease of handling and nominal cost. The optimized PSC is found to show that the power conversion efficiency (PCE) improved by 50% on varying the thickness of CL and is stable even under high humid conditions. The elevated performance of PSCs is ascribed to the appropriate thickness of CL which resulted in improved charge transportation and reduced electron hole recombinations.
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