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Recent Progress in Carbon-Based Buffer Layers for Polymer Solar Cells
摘要： Carbon-based materials are promising candidates as charge transport layers in various optoelectronic devices and have been applied to enhance the performance and stability of such devices. In this paper, we provide an overview of the most contemporary strategies that use carbon-based materials including graphene, graphene oxide, carbon nanotubes, carbon quantum dots, and graphitic carbon nitride as buffer layers in polymer solar cells (PSCs). The crucial parameters that regulate the performance of carbon-based buffer layers are highlighted and discussed in detail. Furthermore, the performances of recently developed carbon-based materials as hole and electron transport layers in PSCs compared with those of commercially available hole/electron transport layers are evaluated. Finally, we elaborate on the remaining challenges and future directions for the development of carbon-based buffer layers to achieve high-efficiency and high-stability PSCs.
关键词： carbon materials,polymer solar cells (PSCs),work function,buffer layer
更新于2025-09-12 10:27:22
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Low-bandgap D-A1-D-A2 type copolymers based on TPTI unit for efficient fullerene and nonfullerene polymer solar cells
摘要： To obtain low-bandgap polymers paired well with fullerene and nonfullerene acceptors, here we adopted a D-A1-D-A2 motif to develop two new low-bandgap copolymers PTPTI-T-BDD and PTPTI-T-FBT, where thiophene was used as the D unit, thieno[2,3-b:5,6-b′]pyrido[3,4-g]thieno[3,2-c]-isoquinoline-5,11(4H,10H)-dione (TPTI) was used as the A1 unit, and benzo[1,2-b:4,5-b′]dithiophene-4,8-dione (BDD) and 5,6-difluoro-2,1,3-benzothiadiazole (FBT) were employed as the A2 unit, respectively. Effects of the electron-withdrawing strength of A2 unit on optoelectronic and photovoltaic properties of the PTPTI-T-BDD- and PTPTI-T-FBT-based fullerene and nonfullerene polymer solar cells (PSCs) were systematically investigated. When blended with PC71BM and ITIC, PTPTI-T-FBT-based PSCs showed a power conversion efficiency (PCE) of 6.20% and 6.03%, respectively, both of which are higher than that of PTPTI-T-BDD-based PSCs. Furthermore, ternary PSCs based on PBDB-T:PTPTI-T-FBT:PC71BM exhibited an improved PCE of 7.92%. This work suggests that constructing D-A1-D-A2 copolymers is a promising strategy to develop low-bandgap copolymers for efficient fullerene and nonfullerene PSCs with a reduced energy loss.
关键词： D-A1-D-A2 copolymers,TPTI,Fullerene and nonfullerene PSCs
更新于2025-09-11 14:15:04
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A Hybrid Inorganic Electron-transporting Layer Coupled with A Halogen-resistant Electrode in CsPbI2Br-Based Perovskite Solar Cells to Achieve Robust Long-term Stability
摘要： Along with the rapidly-developed power conversion efficiencies (PCEs), operational stability of perovskite solar cells (PSCs) becomes the bottleneck for further commercialization. The instability mainly comes from the unstable organic components in the whole devices and the responsive metal electrode to the halogens from perovskites. In this work, we develop a carbide-titanium oxide (C-TiO2) hybrid electron-transporting layer (ETL) and a halogen-resistant Sb electrode on top of the inorganic CsPbI2Br layer to solve the unstable issues. The hybrid C-TiO2 presents uniform and pinhole-free morphology, adequate band structure and electronic property, and observably strong stability. On the other hand, Sb is demonstrated to be effective to restrict inferior ions diffusion and further perovskite decomposition. As a result, our well-designed PSCs achieve both high efficiencies (14.8% for the champion device) and long-term stabilities (< 6% decline @ 85 °C, dark; < 10% decline @ 60 °C, continuous illumination) of 1000 h.
关键词： long term stability,electrode corrosion,Hybrid TiO2 ETLs,inorganic PSCs,inorganic CTLs
更新于2025-09-11 14:15:04
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Influence of PbS Quantum Dots-Doped TiO2 Nanotubes in TiO2 Film as an Electron Transport Layer for Enhanced Perovskite Solar Cell Performance
摘要： Lead sulfide quantum dots-doped titanium dioxide nanotubes (PbS QDs-doped TNTs) were successfully prepared by the hydrothermal and impregnation methods. A thin layer of titanium dioxide (TiO2) comprising of PbS QDs-doped TNTs was applied as an electron transport layer (ETL) in order to improve the planar perovskite solar cell efficiency. The role of incorporating a high surface area of one-dimensional nanotube structure of TiO2 in the conventional TiO2 layer provided a special unidirectional charge transport and a high charge collection. Moreover, doping PbS QDs onto the surface of TNTs modified the electronic and optical properties of the ETL by downshifting the conduction band of TiO2 from ?4.22 to ?4.58 eV, therefore promoting the driving force of an electron injection to the transparent conductive electrode. By varying the concentration of PbS QDs-doped TNTs dispersed in 2-butanol from 0.1 to 0.9 mg/mL, a concentration of 0.3 mg/mL PbS QDs-doped TNTs was the optimum concentration to be mixed with TiO2 solution for the ETL deposition. The best perovskite solar cell performance with the optimum loading of PbS QDs-doped TNTs provided 14.95% power conversion efficiency, which was increased from 12.82% obtained from the cell with pristine TiO2 film as ETL.
关键词： PbS quantum dots (PbS QDs),perovskite solar cells (PSCs),TiO2 nanotubes (TNTs),Electron transport layer (ETL)
更新于2025-09-11 14:15:04
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A hybrid intelligent GMPPT algorithm for partial shading PV system
摘要： Maximum power extraction for PV systems under partial shading conditions (PSCs) relies on the optimal global maximum power point tracking (GMPPT) method used. This paper proposes a novel maximum power point tracking (MPPT) control method for PV system with reduced steady-state oscillation based on improved particle swarm optimization (PSO) algorithm and variable step perturb and observe (P&O) method. Firstly, the grouping idea of shuffled frog leaping algorithm (SFLA) is introduced in the basic PSO algorithm (PSO–SFLA), ensuring the differences among particles and the searching of global extremum. Furthermore, adaptive speed factor is introduced into the improved PSO to improve the convergence of the PSO–SFLA under PSCs. And then, the variable step P&O (VSP&O) method is used to track the maximum power point (MPP) accurately with the change of environment. Finally, the superiority of the proposed method over the conventional P&O method and the standard PSO method in terms of tracking speed and steady-state oscillations is highlighted by simulation results under fast variable PSCs.
关键词： Variable step P&O (VSP&O),Global maximum power point tracking (GMPPT),Under partial shading conditions (PSCs),Particle swarm optimization (PSO),Photovoltaic (PV) system,Adaptive speed factor,Shuffled frog leaping algorithm (SFLA)
更新于2025-09-10 09:29:36
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Effect of TiCl4 Treatment on Different TiO2 Blocking Layer Deposition Methods
摘要： Organolead halid perovskite CH3NH3PbI3 solar cells with all-mesoporous device structure were fabricated with TiO2 blocking layer created by two different methods. Three groups of devices were tested. The TiO2 blocking layer of group 1 was spin-coated with conventional method, while that of groups 2 and 3 was grown by magnetron sputtering of metallic Ti and followed thermal oxidation. Different durations (0, 30, 45, and 60 minutes) of TiCl4 treatment were used during fabrication to study how the performance of each group of solar cells was affected. For all groups of samples, it was obvious that treated samples had much better I-V characteristics that non-treated, with up to 50% improvement in PCE. The difference in the performance improvement was investigated.
关键词： TiCl4 treatment,Perovskite Solar Cells (PSCs),TiO2 blocking layer
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - Bhopal, India (2018.2.24-2018.2.25)] 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - A Fast Global Maximum Power Point Tracking Technique for Partially Shaded PV Arrays
摘要： This paper proposes a new global MPPT method for PV array under non-uniform insolation. The proposed method first tracks the knee point using I-V characteristic which is near to the local peak of the P-V curve. Then it compares the measured power at various knee points to find the region containing global peak. Finally, it uses P&O to find the exact global peak. Thus the proposed method avoids the use of P&O to track every local peak. The performance of the proposed algorithm is further verified in MATLAB/Simulink. The results show that the proposed method is able to track global peak of PV array during Partially Shaded Conditions.
关键词： Partially shaded conditions (PSCs),Boost converter,PV system,Maximum power point tracking (MPPT),I-V curve
更新于2025-09-04 15:30:14