A5051080993- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Advanced battery technologies research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
École Polytechnique Fédérale de Lausanne
2019-2024
Abstract Today's perovskite solar cells (PSCs) mostly use components, such as organic hole conductors or noble metal back contacts, that are very expensive cause degradation of their photovoltaic performance. For future large‐scale deployment PSCs, these components need to be replaced with cost‐effective and robust ones maintain high efficiency while ascertaining long‐term operational stability. Here, a simple low‐cost PSC architecture employing dopant‐free TiO 2 CuSCN the electron...
We report on the preparation of MAPbBr3 perovskite films high electronic quality by applying a methylamine (MA) vapor treatment and mitigating surface defects using amphiphilic molecular passivator, neopentylammonium chloride (NPACl). find that post-treatment with effectively smooths perovskite, eliminating unwanted corrugations producing phase-pure pinhole free films. The subsequent coating NPACl eliminates deleterious states act as electron–hole recombination centers while enhancing...
Metal halide perovskites (MHPs) have shown an incredible increase in efficiency, reaching as high 25.7%, which now competes with traditional photovoltaic technologies. Herein, we excluded CsX and RbX (X = I–, Br–, Cl–), the most commonly used cations to stabilize α-FAPbI3, from bulk of perovskite thin films applied them on surface passivation agents. Extensive device optimization led a power conversion efficiency (PCE) 24.1% fill factor (FF) 82.2% upon CsI. We investigated depth effect CsI...
Abstract The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling growth mechanism crystals a promising way towards increasing their efficiency and stability. Herein, multi‐cation halide composition engineered via two‐step sequential deposition method. Strikingly, it found that adding mixtures 1D polymorphs orthorhombic δ‐RbPbI 3 δ‐CsPbI to PbI 2 precursor solution induces formation porous mesostructured hexagonal films. This porosity greatly...
Its lower bandgap makes formamidinium lead iodide (FAPbI3) a more suitable candidate for single-junction solar cells than pure methylammonium (MAPbI3). However, its structural and thermodynamic stability is improved by introducing significant amount of MA bromide, both which increase the amplify trade-off between photocurrent photovoltage. Here, we simultaneously stabilized FAPbI3 into cubic lattice minimized formation photoinactive phases such as hexagonal PbI2 5% MAPbBr3, revealed...
The defects present in metal halide perovskite are deleterious to both the performance and stability of photovoltaic devices. Consequently, there is an intense focus on developing defect mitigation strategies. Herein we report a facile strategy that employs methylammonium triiodide (MAI3) as additive precursor solution. We examine effect MAI3 structural optoelectronic properties by X-ray diffraction, density functional theory calculations, molecular dynamics simulations, solid-state nuclear...
The systematic advances in the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) have been driven by developments materials, electron transport layer (ETL) interfacial passivation between relevant layers. While zinc oxide (ZnO) is a promising ETL thin film photovoltaics, it still highly desirable to develop novel synthetic methods that allow both fine‐tuning versatility ZnO nanomaterials improving ZnO/perovskite interface. Among various inorganic organic...
Abstract Hole transport materials (HTM) are an important component in perovskite solar cells (PSC). Despite a multitude of HTMs developed recent years, only few them lead to with efficiencies over 20%. Therefore, it is still challenge develop high‐performing HTMs, which have ideal energy levels the frontier orbitals, highly efficient transporting charges, and stabilize cell at same time. In this work, development structurally novel molecular HTM, CPDA 1 , described based on common...
A promising approach for the production of highly efficient and stable hybrid perovskite solar cells is employing mixed-ion materials. Remarkable performances have been reached by materials comprising a stabilized mixture methylammonium (MA+) formamidinium (FA+) as monovalent cation. We compare quantify methods stabilizing FA-based perovskites involving additional blending smaller inorganic cations cesium (Cs+) rubidium (Rb+), which can lead to an improvement in phase purity black cubic...
Metal halide perovskites (MHPs) have shown an incredible rise in efficiency, reaching as high 25.7%, which now competes with traditional photovoltaic technologies. Herein, we excluded CsX and RbX, the most commonly used cations to stabilize FAPbI3, from bulk of perovskite thin films applied them on surface, passivation agents. Extensive device optimization led a power conversion efficiency (PCE) 24.1% fill factor (FF) 82.2% upon CsI. We investigated in-depth effect CsI structural...