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Enhancing Device Performance in Quasi-2D Perovskite ((BA)2(MA)3Pb4I13) Solar Cells by Using PbCl2 Additives
摘要： Quasi-2D Ruddlesden-Popper perovskites (RPPs) exhibit excellent photo/environmental-stability. However, the main drawback is their relatively low photovoltaic properties compared with three-dimensional (3D) perovskites. Herein, we demonstrated that chlorine-based additives via adjusting the proportion of PbI2 and PbCl2 in the precursor (BA)2(MA)3Pb4I13 (n = 4) solutions shows the optimized device performance over 15%, and devices exhibit much-improved humidity stability. Upon PbCl2 addition, the quasi-2D perovskites have larger and more compact grains, which form high quality of films. The photoluminescence gives rise to a much prolonged lifetime under the PbCl2 additive, indicating fewer trap states to reduce the non-radiative recombination. The capacitance characteristics confirm that the PbCl2 additive can largely decrease the trap states in quasi-2D perovskite films. The capacitance-voltage (C-V) characteristics indicate that using PbCl2 additive decreases the charge accumulation towards increasing the charge collection in quasi-2D perovskite solar cells. Our work indicates that addition of PbCl2 is an effective method to improve the device performance by reducing trap states and increasing charge collection towards developing high-performance quasi-2D perovskite devices.
关键词： perovskite solar cells,Quasi-2D,additive,C-V spectra,the active layer
更新于2025-09-19 17:13:59
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High efficiency and stability of inverted perovskite solar cells using phenethyl ammonium iodide modified interface of NiOx and perovskite layers
摘要： The hole transport layer NiOx based inverted perovskite solar cells (PSCs) have advantages of simple fabrication, low temperature and low cost. Furthermore, p-type NiOx material compared to typical n-type SnOX for PSCs has better photo-stability potential due to its lower photocatalysis ability. However, some typical materials modified NiOx layer show relatively simple functions which limit the synthesized performance of NiOx based inverted PSCs. The phenethyl ammonium iodide (PEAI) was introduced to modify NiOx/perovskite interface, which can synchronously contribute to better crystallinity and stability of perovskite layer, passivating interface defects, formed quasi-2D PEA2PbI4 perovskite layer and superior interface contact properties. The PCEs of PSCs with PEAI modified the interface of NiOx/perovskite layer was obviously increased from 20.31 % from 16.54 % of the reference PSCs. The PSCs with PEAI modification remained 75% and 72% of the original PCE values aging for 10 h at 85 °C and 65 days in relative humidity of 15%, which are superior to that (47% and 51%) of the original PCE values for the reference PSCs, respectively. Therefore, PSCs with PEAI modified NiOx/perovskite interface show higher PCEs and better thermal stability and moisture resistance.
关键词： Nickel Oxide,Perovskite Solar cells,quasi-2D,Stability,PEAI
更新于2025-09-12 10:27:22
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Triplet management for efficient perovskite light-emitting diodes
摘要： Perovskite light-emitting diodes are promising for next-generation lighting and displays because of their high colour purity and performance1. Although the management of singlet and triplet excitons is fundamental to the design of efficient organic light-emitting diodes, the nature of how excitons affect performance is still not clear in perovskite2–4 and quasi-two-dimensional (2D) perovskite-based devices5–9. Here, we show that triplet excitons are key to efficient emission in green quasi-2D perovskite devices and that quenching of triplets by the organic cation is a major loss path. Employing an organic cation with a high triplet energy level (phenylethylammonium) in a quasi-2D perovskite based on formamidinium lead bromide yields efficient harvesting of triplets. Furthermore, we show that upconversion of triplets to singlets can occur, making 100% harvesting of electrically generated excitons potentially possible. The external quantum and current efficiencies of our green (527 nm) devices reached 12.4% and 52.1 cd A?1, respectively.
关键词： Perovskite light-emitting diodes,quasi-2D perovskite,external quantum efficiency,triplet excitons,organic cation
更新于2025-09-12 10:27:22
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Uniform Permutation of Quasi-2D Perovskites by Vacuum Poling for Efficient, High-Fill-Factor Solar Cells
摘要： It is widely accepted that vertically aligning quasi-2D perovskites can improve power conversion efficiency due to directional charge transport from small to large-n-value nanoplates. Here, we report a different strategy of uniformly arranging different-n-value 2D nanoplates (PEA2MAn-1PbnI3n+1) based on our vacuum poling method to enable superior isotropic carrier transport. Consequently, the high efficiency of 18.04% with open-circuit voltage of 1.223 V and champion fill-factor (FF) of 82.4% are demonstrated, presenting a new approach to develop advanced quasi-2D perovskite optoelectronic devices.
关键词： isotropic carrier transport,high-fill-factor,vacuum poling,solar cells,quasi-2D perovskites
更新于2025-09-11 14:15:04