Related references
Note: Only part of the references are listed.
Article
Engineering, Electrical & Electronic
Yingjun Chai et al.
Summary: Metal halide perovskites have potential for X-ray detection due to their properties such as high defect tolerance, large diffusion length, and high attenuation efficiency. This study introduced ethylenediamine dihydroiodate (EDDI) as a surface passivation agent to improve the performance of perovskite wafer-based X-ray detectors. The introduction of EDDI greatly suppressed ion migration, reduced dark current, and resulted in a low detection limit and high on-off ratio.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Marise Garcia-Batlle et al.
Summary: The optoelectronic properties of halide perovskite materials have been widely utilized, but understanding their working mechanisms is still challenging due to their mixed ionic-electronic conductive nature. By investigating the current transients of methylammonium lead tribromide samples, it was found that ion migration plays a significant role. The ionic migration model explains the voltage-dependent behavior observed in sample biasing experiments, while the steady-state electronic currents behave nearly ohmically. The estimated ionic mobility is approximately 10(-6) cm(2) V-1 s(-1).
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Osbel Almora et al.
Summary: CsPbBr3 single crystals with optimal optoelectronic properties have potential applications in ionizing-radiation detection devices. However, their mixed ionic-electronic conductivity leads to instability and hysteresis, which hinders long-term operation. Electrical characterization of CsPbBr3 single crystals reveals voltage bias-dependent bulk mobilities and qualitative and quantitative transport differences between bulk and surface mobilities. The formation of space-charge-limited current (SCLC) associated with mechanisms similar to Poole-Frenkel ionized-trap-assisted transport is observed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Philip Calado et al.
Summary: The recent emergence of lead-halide perovskites as active layer materials for thin film semiconductor devices has led to the development of new drift-diffusion models that consider both electronic and mobile ionic charge carriers. This study introduces Driftfusion, a versatile simulation tool for modeling one-dimensional semiconductor devices with mixed ionic-electronic conducting layers. Driftfusion allows users to simulate devices with multiple material layers and different charge carrier species, and it can also simulate transient optoelectronic device measurement protocols. Users have the flexibility to adjust carrier transport, generation, and recombination models, and the discrete interlayer interface approach simplifies the modeling process.
JOURNAL OF COMPUTATIONAL ELECTRONICS
(2022)
Article
Energy & Fuels
Marise Garcia-Batlle et al.
Summary: The long life of perovskite devices in working conditions is a bottleneck for technology application. Stable charge carriers' transport and nonreactive contact materials contribute to increasing the device operation time. This study uses methylammonium lead bromide perovskite single crystals to analyze the current flowing across the perovskite sample after biasing. Two methods, direct measurement and indirect method, are performed to study the transport carrier mechanisms. The results show different responses for displacement currents and direct measurements during long-term biasing.
Article
Chemistry, Multidisciplinary
Bekir Turedi et al.
Summary: Single-crystal halide perovskites can maintain high charge-collection efficiency even with increased thickness without external bias. These findings are significant for the application of perovskite devices in optoelectronic applications that require a thick active layer.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Osbel Almora et al.
Summary: By conducting numerical simulation studies, this paper explains the origin of current transients in thick perovskite samples and provides an explanation and parameterization of the relationship between mobile ion concentration and mobility and current saturation time. The research results suggest that optimizing the material contact interfaces is an effective way to reduce current saturation times in these devices.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Marise Garcia-Batlle et al.
Summary: Ion transport properties in metal halide perovskite have a significant impact on device performance and operation degradation. In X-ray detectors, the dark current level and instability are related to ion migration. This study found that electronic current increases with time and reaches a steady-state value within a certain response time. There is a coupling between electronic transport and ion kinetics. The analysis of MAPbBr(3) suggests that ion mobility is affected by the electric field, while MAPbI(3) is unaffected.
ADVANCED PHOTONICS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Giovanni Armaroli et al.
Summary: MAPbBr(3) perovskite single crystals demonstrate excellent sensitivity and low limit of detection as X-ray and gamma-ray detectors, but thorough studies on the photophysical effects of exposure to high doses of ionizing radiation are still lacking. Controlled X-ray irradiation is found to quench free excitons in the material and introduce new bound excitonic species, although the crystals recover after 1 week of storage in dark and low humidity conditions. Surprisingly, the origin of the new bound excitonic species is attributed to the formation of bromine vacancies, which are filled by atmospheric oxygen and water during the recovery process.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Luca Bertoluzzi et al.
Summary: Studies have shown that metal halide perovskite solar cells exhibit interesting behavior in reverse bias, including reversible performance loss and non-reversible degradation. An advanced drift-diffusion approach incorporating an electrochemical term is used to explain the losses in short-circuit, open circuit, and fill factor measured experimentally after prolonged reverse bias.
ADVANCED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhizai Li et al.
Summary: X-ray detection has been widely utilized in various fields, and halide perovskites as alternative materials show great potential in high-performance X-ray detectors. Through advanced research and optimization strategies, the performance of X-ray detectors based on halide perovskites has reached a comparative height.
Article
Materials Science, Multidisciplinary
Shanshan Jia et al.
Summary: Lead halide perovskite-based X-ray detectors exhibit high sensitivity and low detection limit, showing potential for use in next-generation radiation detection. The diode-structured devices show unusually high photocurrent gain under small reversed bias voltage. Further research reveals that ion migration and accumulation in the perovskite material are responsible for the unique photoconductor properties observed in the devices.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Nanoscience & Nanotechnology
Marise Garcia-Batlle et al.
Summary: Metal halide perovskites have favorable optoelectronic properties but face instability and degradation issues in long timescales.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Sarah Deumel et al.
Summary: This paper describes a method to create X-ray flat-panel detector arrays based on microcrystalline MAPbI(3) using a two-step manufacturing process, achieving high spatial resolution and sensitivity by separating the fabrication of absorber wafers from their integration on pixelated backplanes.
NATURE ELECTRONICS
(2021)
Article
Physics, Applied
Oriane Baussens et al.
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Marise Garcia-Batlle et al.
ADVANCED ELECTRONIC MATERIALS
(2020)
Article
Optics
Shreetu Shrestha et al.
Article
Nanoscience & Nanotechnology
Babak Olyaeefar et al.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2017)
Article
Physics, Applied
Osbel Almora et al.
APPLIED PHYSICS LETTERS
(2016)
News Item
Optics
Wolfgang Heiss et al.
Article
Optics
Haotong Wei et al.
Article
Multidisciplinary Sciences
M. D. Birowosuto et al.
SCIENTIFIC REPORTS
(2016)