Perovskite Solar Cells
Light‐intensity analysis of JV parameters is introduced by Yulia Galagan and Damian Glowienka in article number 2105920 as a simple method to allow understanding of the ...dominating mechanisms that limit device performance in perovskite solar cells. The method is based on the drift–diffusion model and is aimed at helping in the explanation of parasitic losses from trap‐assisted recombination or ohmic losses in devices.
A two-step sequential deposition method has been applied to prepare the solar cells with two types of perovskites Cs0.15FA0.85Pb(I0.95Cl0.05)3 and Cs0.15FA0.85Pb(I0.95Br0.05)3. In order to obtain the ...perovskite layers, the different sources of bromine and chlorine atoms were used for synthesis. The performance and time stability of chloride-based photocells are worse in comparison to the bromide-based devices. It can be explained by the effect of an accumulation of Cl atoms at the interfaces between the chloride-based perovskites and the layer of PCBM. Such a process causes an increasing of interface recombination. Also, the bulk density of states and, consequently, the bulk recombination of charge carriers seem to be higher for the perovskite layers obtained with chlorine atoms. The two-step technique applied to create the bromide perovskites less influences the photocells performance as in the case of one-step deposition. We can explain this observation by an existence of nucleation sites in the inorganic layer which improve the growth of a perovskite material.
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•The sequential deposition method was applied to prepare perovskite solar cells.•The dual cation (2C) perovskites were investigated.•Different sources of Br and Cl atoms were used for synthesis of perovskites.
Perovskite Solar Cells
In article number 2300791, Su and co‐workers explored the physics of perovskite solar cells made from fully up‐scalable slot–die coating technique in air for the understanding ...of dominant electrical loss mechanisms. The findings have led the way to reduce both bulk defect density and charge carrier transportation losses at the hole‐transporting layer/perovskite interface with the chemical passivation technique.
Perovskite solar cells (PSC) are emerging technologies that have shown continuous improvement in power conversion efficiency (PCE) and stability. However, a very important aspect that has been seldom ...considered is the reproducibility of PCE of PSC devices. It is possible to achieve PCE from 10.21% to 17.05% using scalable slot‐die‐coating technique. However, a spatial distribution of performance is clearly observed for device samples on a 4 × 4 cm substrate. The relatively low PCE is mainly coming from the losses of electrical mechanism. To have in‐depth understanding of the losses, the dominant loss analysis techniques including numerical simulations are used to explore the mechanism. In the results, it is indicated that a part of efficiency decrease is due to the increase of bulk defect density which linearly changes with the quality of the perovskite layer and related to recombination process. However, extremely high‐charge‐carrier transportation losses are found at the HTL/perovskite interface that are related to the Fermi‐level pinning mechanism for low‐efficiency device. The result of physics insight of perovskite solar cells leads to a strategy, where chemical passivation technique is used to achieve the PCE from 13.81% to 18.07% for the batch of devices with good reproducibility.
Herein, the perovskite solar cells made from slot‐die‐coating technique is studied in depth. In the results, it is indicated that efficiency decrease is due to the increase of bulk defect density, and also extremely high‐charge‐carrier transportation losses at the interface of perovskite layer. The results leads to a strategy of chemical passivation that improves efficiency and reproducibility of the devices.
To achieve the highest performance using perovskite solar cells it is necessary to understand all the dominant mechanisms which affect the operation of solar cell. Here, we have investigated the bulk ...and interface trap-assisted recombination processes in the solar cells with p-i-n architecture. These studies are based on the numerical and experimental methods to get better understanding of these physical processes. The following results are useful for optimization of the performance of perovskite solar cells.
Perovskite Solar Cells
In article number 2100891, Yu‐Ching Huang, Wei‐Fang Su, and co‐workers developed a highly efficient semi‐transparent perovskite solar cell (ST‐PVSC) using a unique electron ...transport layer of ligand modified SnO2 on a fullerene derivative and near‐infrared transparent conducting electrode of cerium doped SnO2. The high efficiency 4‐terminal perovskite/silicon tandem solar cells are obtained by employing this new ST‐PVSC.
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