Interface instability has evolved into the primary aspect
that
limits the durability improvement of perovskite solar cells (PSCs).
Interface modification with suitable molecules is widely considered
an effective path for improving the interface state. Herein, an ionic
liquid modified layer, 1-ethyl-3-methylimidazolium aminoacetate (EMIMAE),
is brought to modify NiO
x
/perovskite interface.
The EMIMAE layer can interact with the adjacent layer to regulate
the perovskite growth, passivate defects in the film, and promote
charge transport in PSCs. Eventually, the optimized device’s
efficiency rises to 18.6%, which is a substantial improvement over
the control device. Particularly, after 1000 h of continuous maximum
power point tracking, the device can still retain 95% of its initial
efficiency. This work proposes a simple idea to ameliorate the device
interface and boost the commercialization of NiO
x
based devices.
Until now, poly(3,4‐ethylenedioxythiophene):poly(styrensulfonate) (PEDOT:PSS) is widely used in Sn–Pb perovskite solar cells (PSCs) due to its many advantages, including high optical transparency, suitable conductivity, superior wettability, and so on. However, the acidic and hydroscopic properties of the PSS component, as well as the incongruous energy level of the hole transport layer (HTL), may lead to unsatisfying interface properties and decreased device performance. Herein, by adding polyethylene glycol dimethacrylate (PEGDMA) into PEDOT:PSS, a newly crosslinked‐double‐network obtain of PEDOT:PSS@PEGDMA film, which could not only optimize nucleation and crystallinity of Sn–Pb perovskite films, but also suppress defect density and optimize energy level alignment at the HTL/perovskite interface. As a result, the achieves highly efficient and stable mixed Sn–Pb PSCs with an encouraging power conversion efficiency of 20.9%. Additionally, the device can maintain good stability under N2 atmosphere.
Although perovskite solar cells have achieved great breakthroughs in photoelectric conversion efficiency (PCE), some challenges still need to be addressed before commercialization. Lead leakage is harmful to the environment and many methods are developed to prevent lead leakage; among them, chemical adsorption has proved to be an effective way. Herein, a simple and low‐cost strategy that can enhance the device performance and mitigate the lead leakage by applying l‐phenylalanine in the interface of NiOx/perovskite is reported. The results show that this strategy can improve the morphology and conductivity of the NiOx film, optimize the NiOx/perovskite interface energy level, resulting in an efficient and stable device with a PCE of 19.0%. Furthermore, the interface modification improves the stability of the perovskite film through strong interaction with the perovskite, inhibits the decomposition of the film in water, slows down the process of lead leakage, and protects the environment from lead pollution. The devices maintain 86% initial efficiency for 200 h maximum power point measurement and 94% for 2100 h under nitrogen.
Although the research of formal perovskite solar cells (PSCs) has achieved great breakthroughs, the use of doped small-molecule organic hole transport layers limits the improvement of stability. PSCs with an inverted form show great potential in a more stable device structure. In this paper, a NiO x /3D perovskite interface in inverted PSCs was modified with a polymerizable amine salt (2-methylallylamine hydroiodide (CTBAI)) interlayer. The double bonds contained in CTBAI thermally induced polymerization of a thin film after heat treatment, resulting in the formation of amine salts with longer molecular chains. The modified layer can improve crystallinity and reduce defects in the film, as well as optimize the interface energy level and reduce interface recombination. The efficiency of NiO x -based inverted PSCs based on the optimized interface increased from 17.0% to 18.2%. After 280 h of MPP testing, the encapsulated device tested in ambient air (RH = 50−60%) demonstrated a robust light stabilization and maintained over 93% efficiency.
Compositional engineering of perovskite precursors has been widely implemented to elevate the performance of perovskite solar cells (PSCs). Nevertheless, there is a lack of studies on the relationship between the I/Pb ratio and the solid perovskite film. In this work, iodine (I 2 ) was employed to tune the perovskite crystallization and control the I/Pb ratio of a two-dimensional (2D) perovskite film. A high-quality 2D (ThMA) 2 (MA) 4 Pb 5 I 16 perovskite film with wellaligned phase alignment was obtained at the optimal I/Pb ratio of 3.02. We achieved a champion device performance of 17.3% and an impressive open-circuit voltage (V oc ) of 1.19 V, which is one of the highest [power conversion efficiency (PCE)/V oc ] for thiophene spacer-based 2D Ruddlesden−Popper PSCs. Moreover, the optimized device with encapsulation demonstrated long-term operational stability, retaining 90% PCE after 500 h in dark high-humidity conditions.
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