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Additivea??Assisted Hota??Casting Free Fabrication of Diona??Jacobson 2D Perovskite Solar Cell with Efficiency Beyond 16%
摘要： Two-dimensional (2D) Dion-Jacobson (DJ) perovskite solar cells (PVSCs) with high power conversion efficiency (PCE) are currently predominately fabricated via a hot-casting process. The reason lies in the difficulty in preparing high-quality perovskite film under mild condition when the application of divalent ammonium removes the weak interaction from the spacer cation layer. In this work, the morphology of the 2D DJ perovskite film with rigid piperidinium ring is tuned through room-temperature spin-coating method, with the aid of methylammonium thiocyanate (MASCN) additive. With optimized amount of MASCN addition, the perovskite films deposited on poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA)/poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-uorene)-alt-2,7-(9,9-dioctylfuorene)] (PFN) substrate exhibit fine crystallinity, preferred orientation, decreased defects and better energy level alignment with the hole transport layer. The device with inverted planar structure presents JSC of 17.91 mA cm-2, VOC of 1.19 V, FF of 0.76, with a maximum PCE of 16.25%, which is the highest PCE for 2D DJ PVSCs free of hot-casting. The unsealed device maintained around 80% of its initial efficiency after 35 days exposure to air (Hr = 45 ± 5%). This work provides a potential route towards high performance 2D DJ PVSCs.
关键词： additive,2D perovskite,film morphology,charge transport,growth orientation
更新于2025-09-23 15:19:57
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Enhancing the stability of perovskite solar cells through functionalisation of metal oxide transport layers with self-assembled monolayers
摘要： A systematic study of the application of self-assembly monolayers (SAMs) onto electron and hole transporting layers for perovskite solar cells (PSCs) stability is reported. Cs0.05FA0.83MA0.17Pb(I0.87Br0.13)3 (FMC) perovskite films were deposited onto tin oxide (SnO2) and nickel oxide (NiOx) layers that were functionalized with ethylphosphonic acid (EPA) and 4-bromobenzoic acid (BBA) SAMs. X-ray diffractometry measurements were performed on these films shortly after they were deposited. The diffractograms agree with the positions reported in the literature for the crystal structure of the FMC. The results show that the deposition of SAMs on the metal oxide layers yields positive improvements in the FMC film stability and in the device stability when using FMC as the active layer. The work shows that by adopting SAMs, the long-term stability of PSCs cells under accelerated test conditions can be enhanced, and this provides one step on the way to making this technology a commercial reality.
关键词： Degradation study,Perovskite film,Self-assembly monolayer,Perovskites device,Temperature induced degradation,Light induced degradation
更新于2025-09-23 15:19:57
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Utilizing MVAD method to optimize crystallization and nanostructured surface of the perovskite film: Toward electroluminescent and ultraviolet photodetective bifunctional optoelectronics
摘要： Metal-halide perovskite of MAPbBr3, by exhibiting several remarkable optoproperties such as tunable energy bandgap, high absorption coefficients, high color purity, and long charge carrier diffusion lengths, has made great contributions to photovoltaic and electroluminescent (EL) technologies, i.e., solar cell, photodetector, light-emitting diode, and newly developed bifunctional optoelectronics. To realize high performance bifunctional optoelectronics, it is imperative to promote the balance of the trade-off between effective radiative recombination during EL process and fast exciton dissociation in photodetective process. Herein, we optimize the crystallization and nanostructured surface of MAPbBr3 film through applying multistep vapour assisted deposition (MVAD) method. Then, we enhance the optical field distribution and charge transfer feature of MAPbBr3 film by establishing an optical simulation model. Based on our modifed MAPbBr3 active layer, finally, we demonstrate a high performance device with EL and ultraviolet photodetective bifunctions, which exhbits a 6.27-fold improvement of brightness and a 3 orders of magnitude increase of detectivity. To the best of our knowledge, this work not only reports high bifunctional perovskite optoelectronics performance, but also illustrates the optical field redistribution process in horizontal orientation surface of MAPbBr3 films for relevant researchers.
关键词： Nanostructured surface,Perovskite film,Multistep vapour assisted deposition,Crystallization,Bifunctional optoelectronics
更新于2025-09-19 17:15:36
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Glass rod-sliding and low pressure assisted solution processing composition engineering for high-efficiency perovskite solar cells
摘要： High-efficiency perovskite solar cells (PSCs) have experienced rapid development and attracted significant attention in recent years. The PSCs based on doctor bladed or slot-die coated perovskite films usually have lower power conversion efficiency (PCE) than that based on spin-coated perovskite films. In this work, we have developed an effective method, called glass rod-sliding and low pressure assisted solution processing composition engineering (GRS-LPASP), to manufacture high quality perovskite film in air. GRS-LPASP composition engineering effectively increases the grain size and thickness of perovskite films and reduces the defect density by increasing the contact area between the perovskite layer and the hole transport layer, thus leading an increased current density (Jsc) of perovskite solar cells. The device with GRS-LPASP composition engineering achieves a maximum PCE of 19.78%. The experimental results demonstrates that GRS-LPASP composition engineering is a feasible method to prepare high-efficiency PSCs. Moreover, GRS-LPASP composition engineering also provides a potential approach for the commercial production of PSCs.
关键词： Low pressure assisted method,Glass rod-sliding,Perovskite film,Perovskite solar cell
更新于2025-09-19 17:13:59