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High-Performance Inverted Perovskite Solar Cells using 4-Diaminomethylbenzoic as Passivant
摘要： Grain boundaries (GBs) and interface passivation of perovskite films impact the efficiency and stability of perovskite solar cells (PSCs) dramatically. Here, an efficient passivation strategy using 4-Diaminomethylbenzoic (4-DA) followed by thermal annealing treatment is proposed to improve the performance of PSCs. We have systemically investigate the impact of 4-DA on the physical properties of perovskite layer and corresponding performance of the inverted PSCs. The results show that the contact between crystalline grains are improved, and high quality MAPbI3 films are successfully prepared, which result in the elimination of the trap states and enhanced performance of the devices. The highest power conversion efficiency (PCE) of 20.58% is achieved in this work. Meanwhile, the devices show enhanced stability and the average PCE values almost maintained the same after 168 hours storage without any encapsulation. The passivation method developed in this work shows a novel strategy toward the fabrication of inverted PSCs with high efficiency and high stability.
关键词： passivation strategy,trap states,inverted perovskite solar cells
更新于2025-09-23 15:19:57
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The Effect of Lithium‐Doping in Solution‐Processed Nickel Oxide Films for Perovskite Solar Cells
摘要： The effect of substitutional Li doping into NiOx hole transporting layer (HTL) for use in inverted perovskite solar cells was systematically studied. Li doped NiOx thin films with preferential crystal growth along the (111) plane were deposited using a simple solution-based process. Mott-Schottky analysis showed that hole carrier concentration (NA) is doubled by Li doping. Utilizing 4% Li in NiOx improved the power conversion efficiency (PCE) of solar devices from 9.0% to 12.6%. Photoluminescence quenching investigations demonstrate better hole capturing properties of Li:NiOx compared to that of NiOx, leading to higher current densities by Li doping. The electrical conductivity of NiOx is improved by Li doping. Further improvements of the device were made by using an additional ZnO layer onto PCBM, to remove shunt paths, leading to a PCE of 14.2% and a fill factor of 0.72.
关键词： nickel oxide,lithium doping,hole transporting layer,inverted perovskite solar cells
更新于2025-09-19 17:13:59
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Performance improvement of inverted perovskite solar cells using TiO2 nanorod array and mesoporous structure
摘要： In view of the low carrier mobility of organic materials, the carrier collection ability was suffered from the short transport length before carriers were recombined. To improve performances by enhancing carrier collection ability, the optimal period was 1.5 μm which was obtained by changing the period of titanium dioxide (TiO2) nanorod array in the inverted perovskite solar cells (IPSCs). The power conversion efficiency was improved to 11.96% from the 7.66% of the standard planar IPSCs. Besides, due to the inherent properties of high absorption surface area and high light scattering ability, the 150-nm-thick TiO2 mesoporous layer was embedded in the TiO2 electron transport layer. By changing the annealing temperature, the optimal crystallinity of anatase phase and the optimal porous distribution were obtained in the TiO2 mesoporous layers annealed at 500 °C for 30 min. Using the optimal annealed TiO2 mesoporous layers in the IPSCs, the power conversion efficiency was improved to 12.73%. The power conversion efficiency of 14.47% was obtained for the IPSCs embedded with the optimal 1.5-μm-periodic TiO2 nanorod array and the optimal 500 °C-annealed TiO2 mesoporous layer in the electron transport layer, simultaneously.
关键词： Nanorod array,Laser interference lithography system,Titanium dioxide material,Mesoporous layer,Inverted perovskite solar cells
更新于2025-09-16 10:30:52
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A Dual Role of Amino-functionalized Graphene Quantum Dots in NiOx Films for Efficient Inverted Flexible Perovskite Solar Cells
摘要： NiOx has been widely used as an effective hole transport material for inverted perovskite solar cells (PSCs), particularly flexible PSCs, owing to its low-temperature processing, low cost, and good electron blocking ability. However, the band structure alignment between low-temperature-processed NiOx and the perovskite layer is not satisfactory, resulting in reduced photovoltaic performance. Herein, we report a novel strategy to tune the NiOx hole transport layer for achieving high-performance flexible PSCs. Amino-functionalized graphene quantum dots (AGQDs) are employed in the NiOx film as a dual-role additive. On the one hand, the added AGQDs can provide abundant N atoms at the modified NiOx layer surface to enhance the crystallization of the perovskite film by a Lewis base-acid interaction. On the other hand, the AGQDs can optimize the band structure alignment between the NiOx and perovskite layers, facilitating hole extraction at the NiOx/perovskite interface. As a result, the inverted flexible PSCs exhibit a champion efficiency of 18.10%, which is comparable to the values reported for the current state-of-the-art inverted flexible PSCs. In addition to good air stability, our best flexible device has excellent mechanical stability, retaining 88% of its initial efficiency after continuously bending 1000 times. This new strategy highlights a promising way to enhance the performance of inverted flexible PSCs.
关键词： flexible,amino functionalization,graphene quantum dots,NiO,inverted perovskite solar cells
更新于2025-09-16 10:30:52
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Polyfluorene Copolymers as High‐Performance Hole Transport Materials for Inverted Perovskite Solar Cells
摘要： Inverted perovskite solar cells (PSCs) that can be entirely processed at low temperatures have attracted growing attention owing to their cost-effective production. Hole-transport materials (HTMs) play an essential role in achieving efficient inverted PSCs, as they determine the effectiveness of charge extraction and recombination at interfaces. In this study, three polyfluorene copolymers (TFB, PFB and PFO) were investigated as HTMs for construction of inverted PSCs. It is found that the photovoltaic performance of the solar cells is closely correlated with the electronic properties of the HTMs. Owing to its high mobility along with the favored energy level alignment with perovskite, TFB showed superior charge extraction and suppressed interfacial recombination than PFB- and PFO-based devices, which delivers a high efficiency of 18.48% with an open-circuit voltage (VOC) of up to 1.1 V. In contrast, the presence of a large energy barrier in the PFO-based devices resulted in substantial losses in both VOC and photocurrent. These results demonstrate that TFB could serve as a superior HTM for inverted PSCs. Moreover, we anticipate that the performance of the three HTMs identified here might guide molecular design of novel HTMs for the manufacture of highly efficient inverted PSCs.
关键词： hole-transport materials,charge extraction,polyfluorene copolymers,photovoltaic performance,inverted perovskite solar cells
更新于2025-09-12 10:27:22
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Novel NiO Nanoforest Architecture for Efficient Inverted Mesoporous Perovskite Solar Cells
摘要： Inverted perovskite solar cells (PSCs) demonstrates attractive features in developing air-stable photovoltaic device, by employing inorganic hole transport layers (HTLs). However, their power conversion efficiencies (PCEs) are still inferior to that of mesoporous n-i-p devices, mainly attributed to the undesirable hole extraction and interfacial recombination loss. Here, we design a novel one-dimensional NiO nanotubes (NTs) nanoforest as efficient mesoporous HTLs. Such NiO NTs mesoporous structure provides the highly conductive pathway for rapid hole extraction, and depresses interfacial recombination loss. Furthermore, excellent light capturing could be achieved by optimizing length and branch growth of NiO NTs nanoforest, which mimics the evolution of natural forest. Therefore, this inverted mesoporous PSCs yields an optimal efficiency of 18.77%, which is still prominent in state-of-the-art NiO-based devices. Alternatively, the mesoporous device exhibits greatly improved long-term stability. This work provides a new design perspective for developing high-performance inverted PSCs.
关键词： mesoporous structure,NiO,hole transporting layer,Inverted perovskite solar cells,nanotube nanoforest
更新于2025-09-12 10:27:22
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Enhanced Near‐Infrared Photoresponse of Inverted Perovskite Solar Cells Through Rational Design of Bulk‐Heterojunction Electron‐Transporting Layers
摘要： How to extend the photoresponse of perovskite solar cells (PVSCs) to the region of near-infrared (NIR)/infrared light has become an appealing research subject in this field since it can better harness the solar irradiation. Herein, the typical fullerene electron-transporting layer (ETL) of an inverted PVSC is systematically engineered to enhance device’s NIR photoresponse. A low bandgap nonfullerene acceptor (NFA) is incorporated into the fullerene ETL aiming to intercept the NIR light passing through the device. However, despite forming type II charge transfer with fullerene, the blended NFA cannot enhance the device’s NIR photoresponse, as limited by the poor dissociation of photoexciton induced by NIR light. Fortunately, it can be addressed by adding a p-type polymer. The ternary bulk-heterojunction (BHJ) ETL is demonstrated to effectively enhance the device’s NIR photoresponse due to the better cascade-energy-level alignment and increased hole mobility. By further optimizing the morphology of such a BHJ ETL, the derived PVSC is finally demonstrated to possess a 40% external quantum efficiency at 800 nm with photoresponse extended to the NIR region (to 950 nm), contributing ≈9% of the overall photocurrent. This study unveils an effective and simple approach for enhancing the NIR photoresponse of inverted PVSCs.
关键词： bulk-heterojunctions,electron-transporting layers,inverted perovskite solar cells,nonfullerene acceptors,NIR photoresponse
更新于2025-09-11 14:15:04