Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
The outstanding and versatile optoelectronic properties of halide perovskite materials, have allowed their utilization in many applications, such as solar cells, light-emitting diodes, lasers but also in X-ray imaging and ionizing radiation detectors. The promising sensitivity and favorable characteristics (high absorption coefficient, long carrier diffusion length, and long carrier lifetime) have motivated arduous research in the field of high-energy radiation detectors.However, unravelling their working mechanisms remains challenging because of their mixed ionic–electronic conductive nature. Even so, the persistent drawback of ion-migration which results in large noise with deleterious dark current. Consequently, under a large electric field, the induced dark current and photocurrent drift can modify the intrinsic performance of the detector. Hereby, we used chronoamperometry experiments with the purpose of registering the long-time current transient response of different composition of monocrystalline (SC) and polycrystalline (PC) perovskite samples of MAPbBr3[1] and MAPbI3[2] with high reproducibility. Sample biasing experiments (ionic drift), with characteristic times exhibiting voltage dependence as ∝ V–3/2, is interpreted with an ionic migration model obeying a ballistic-like voltage-dependent mobility (BVM) regime of space-charge-limited current [1]. Furthermore, using the ionic dynamic doping model (IDD)[2] for the recovering current at zero bias (ion diffusion), the ionic mobility is estimated to be ∼10–6 cm2 V–1 s–1 .Our findings suggest that ionic currents are negligible in comparison to the electronic currents; however, they influence them via changes in the charge density profile.
This work has received funding from the European Union’s Horizon 2020 research and innovation program under the Photonics Public Private Partnership (www.photonics21.org) with the project PEROXIS under the grant agreement N° 871336
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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