A5003664911- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Nonlinear Optical Materials Research
- UAV Applications and Optimization
- Remote Sensing and LiDAR Applications
Oxfam
2019
University of Oxford
2014-2019
Clarendon College
2017-2019
Organic–inorganic metal halide perovskites have recently emerged as a top contender to be used an absorber material in highly efficient, low-cost photovoltaic devices. Solution-processed semiconductors tend high density of defect states and exhibit large degree electronic disorder. Perovskites appear go against this trend, despite relatively little knowledge the impact defects, certified solar-to-electrical power conversion efficiencies up 17.9% been achieved. Here, through treatment crystal...
Highest reported efficiency cesium lead halide perovskite solar cells are realized by tuning the bandgap and stabilizing black phase at lower temperatures. CsPbI2Br is employed in a planar architecture device resulting 9.8% power conversion over 5% stabilized output. Offering substantially enhanced thermal stability their organic based counterparts, these results show that all-inorganic perovskites can represent promising next step for photovoltaic materials. As service to our authors...
Tandem perovskite cells The ready processability of organic-inorganic materials for solar should enable the fabrication tandem cells, in which top layer is tuned to absorb shorter wavelengths and lower remaining longer-wavelength light. difficulty making an all-perovskite cell finding a material that absorbs red end spectrum. Eperon et al. developed infrared-absorbing mixed tin-lead can deliver 14.8% efficiency on its own 20.3% four-terminal cell. Science , this issue p. 861
An understanding of charge-carrier recombination processes is essential for the development hybrid metal halide perovskites photovoltaic applications. We show that typical measurements radiative bimolecular constant in CH3NH3PbI3 are strongly affected by photon reabsorption masks a much larger intrinsic rate constant. By investigating set films whose thickness varies between 50 and 533 nm, we find charge appears to slow an order magnitude as film increases. However, using dynamical model...
Methylammonium tin triiodide (MASnI3) has been successfully employed in lead-free perovskite solar cells, but overall power-conversion efficiencies are still significantly lower than for lead-based perovskites. Here we present photoluminescence (PL) spectra and time-resolved PL from 8 to 295 K find a marked improvement carrier lifetime substantial reduction line width below ∼110 K, indicating that the cause of hindered performance is activated at orthorhombic tetragonal phase transition. Our...
Abstract Mixed lead–tin triiodide perovskites are promising absorber materials for low bandgap bottom cells in all‐perovskite tandem photovoltaic devices. Key structural and electronic properties of the FAPb 1− x Sn I 3 perovskite presented here as a function lead:tin content across alloy series. Temperature‐dependent photoluminescence optical absorption measurements used to identify changes phase transition temperature. The large bowing parameter, crucial element attainment bandgaps this...
Hysteresis in the current–voltage characteristics of vapor-deposited perovskite solar cells is shown to originate from an amorphous region CH3NH3PbI3 at interface with device's electron transport layer. Interface engineering used produce highly crystalline material this which results hysteresis-free evaporated planar heterojunction cells. Metal halide materials show great promise for photovoltaic devices, power conversion efficiencies (PCE) based on class having recently exceeded 22%.1...
We examine the initial growth modes of MAPbI<sub>3</sub> films deposited by co-evaporation, with average thicknesses from 2–320 nm. Electronic quantum confinement effects are observed for thickness below 40