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Revealing the compositional effect on the intrinsic long-term stability of perovskite solar cells
摘要： Understanding role of individual cation and halide components on the intrinsic long-term stability of perovskite solar cells (PSCs) is of great importance to pursue devices with high efficiency and superior long-term stability simultaneously. In this work, we report a low dopant content (1%) doping strategy to reveal the role of individual bromide and methylammoniun (MA) on the intrinsic operational stability of formamidinium lead iodide (FAPbI3-based) PSCs. This strategy enables us to tune the trap density of perovskite films while keep their apparent morphological and optical properties unchanged. Our results demonstrate that incorporation of MA into the FAPbI3-based PSCs is harmful to the long-term stability due to defect-induced degradation. And Br incorporation is beneficial to enhance the stability of FAPbI3-based PSCs via suppressing the trap density in the perovskite films. This work highlights the importance of defects management for improving the long-term operational stability of perovskite solar cells.
关键词： compositional effect,defects management,intrinsic stability,trap density,perovskite solar cells
更新于2025-09-23 15:21:01
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Chemical Approaches for Stabilizing Perovskite Solar Cells
摘要： Chemical bonding dictates not only the optoelectronic properties of materials, but also the intrinsic and extrinsic stability of materials. Here, the causes of intrinsic and extrinsic instability of perovskite materials are reviewed considering their correlation with the unique chemical-bonding nature of perovskite materials. There are a number of key standardized stability tests established by the International Electrotechnical Commission for commercialized photovoltaic modules. Based on these procedures, the possible causes and related mechanisms of the material degradation that can arise during the test procedures are identified, which are discussed in terms of their chemical bonds. Based on the understanding of the critical causes, promising strategies for mitigating the causes to enhance the stability of perovskite solar cells are summarized. The stability of the state-of-the-art perovskite solar cells implies a need for the development of improved stability-testing protocols to move onto the next stage toward commercialization.
关键词： intrinsic,stability,perovskites,extrinsic,solar cells
更新于2025-09-16 10:30:52
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Boosting photovoltaic properties and intrinsic stability for MA-based perovskite solar cells by incorporating 1,1,1-trimethylhydrazinium cation
摘要： The most critical reason for limiting the extensive study and promotion of MA-based perovskites is their intrinsic instability when compared to FA-based perovskites. Therefore, it is necessary to develop a simple and effective method to improve their intrinsic stability. Herein, 1,1,1-trimethylhydrazinium cation (TMH+) was firstly introduced into MAPbI3 to fabricate high-performance mixed-cation perovskite solar cells (PSCs) with enhanced power conversion efficiency (PCE) of 19.86%, which benefits by the improved crystallization and morphology of films. On the one hand, the slightly large size of TMH+ is complementary to the low tolerance factor of MAPbI3 and then enhance the structure stability. On the other hand, the presence of methyl groups in TMH+ is beneficial to promote the hydrophobicity of MA-based perovskite. More importantly, the hydrazinium group can effectively inhibit the production of Pb0 in perovskites which is the initial stages of degradation. As a result, the intrinsic stability of PSCs has been observably boosted. After aging at 45±5% RH for 1800 h and 85 °C for 200 h, the unencapsulated PSCs retained 77% and 79% of initial PCE, respectively. This work provides a new design thought of the selection of suitable cations with special structure and chemical groups to enhance the moisture resistance and intrinsic stability of MA-based perovskite at the source of degradation.
关键词： 1,1,1-trimethylhydrazinium cation,intrinsic stability,perovskite solar cells,photovoltaic properties,MAPbI3
更新于2025-09-16 10:30:52
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Ionic selective contact controls the charge accumulation for efficient and intrinsic stable planar homo-junction perovskite solar cells
摘要： The under-coordinated ionic defects at the surface and grain boundaries of organic-inorganic halide perovskite always attract and trap the free carriers via the electrostatic force and accelerate the ions migration by defect vacancies channels, significantly limiting the charge extraction efficiency and intrinsic stability of perovskite solar cells (PSCs). Here, a novel strategy of ionic layer induced homo-junction perovskite reinforced the build in field (Ebi) is proposed to further decrease trap recombination and suppress the ions migration, thereby enhancing the power conversion efficiencies (PCEs) and intrinsic stability of PSCs. Experiments and theories certify that the adsorbed cations and anions will not only give rise to interface charge accumulation/depletion of perovskite, resulting in boarder distributed and reinforced Ebi, but also increased the interface ions vacancy migration barriers via the extra ionic interaction. As a result, the resultant n-i-p PSCs showed a record PCE of 20.88% among the organic electron transfer layer (ETL) and deliver a high stability of 88% after aged 60 days in atmosphere without encapsulation. Our findings provide a new insight to further eliminate the side effect of ionic defects and guide to design newly contact interface to minimize the trap recombination and ions motion induced intrinsic stability of PSCs.
关键词： intrinsic stability,organic electron transportation layer,perovskite solar cell,band blending,surface ionic doping
更新于2025-09-11 14:15:04
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Highly Promoted Carrier Mobility and Intrinsic Stability by Rolling Up Monolayer Black Phosphorus into Nanoscrolls
摘要： Rolling up two-dimensional (2D) materials into nanoscrolls could not only retain the excellent properties of their 2D hosts, but also display intriguing physical and chemical properties that arise from their 1D tubular structures. Here, we report a new class of black phosphorus nanoscrolls (bPNSs), which are stable at room-temperature and energetically more favorable than 2D bP. Most strikingly, these bPNSs hold tunable direct band gaps and extremely high mobilities (e.g., the mobility of the double-layer bPNS is about 20-fold higher than that of 2D bP monolayer). Their unique self-encapsulation structure and layer-dependent conduction band minimum can largely prevent the entering of O2 and the production of O?2 and thereby suppress the possible environmental degradation as well. The enhanced intrinsic stability and promoted electronic properties render bPNSs great promise in many advanced electronics or optoelectronics applications.
关键词： optoelectronic applications,black phosphorus nanoscrolls,carrier mobility,intrinsic stability,electronic properties
更新于2025-09-09 09:28:46