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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - P-type SiOx front emitters for Si heterojunction solar cells
摘要： We have applied p-type nanocrystalline silicon-oxide (p-SiOx) as front emitter in silicon heterojunction solar cells. The evolution of structural, optical, and electrical properties of p-SiOx as a function of the carbon-dioxide/silane flow rate ratio used in the gas mixture has been investigated, comparing also the film characteristics with those of p-type amorphous and nanocrystalline silicon thin films often used in the cells. Selected p-SiOx films with suitable electrical properties have been inserted in silicon heterojunction solar cells based on n-type FZ c-Si <100> wafers, passivated with ultrathin intrinsic a-Si:H buffers. Improvement of all the photovoltaic parameters has been observed with the emitter with higher oxygen content. The results have been correlated with the increased transparency and enhanced field-effect passivation obtained thanks to the presence of sufficient carbon dioxide in the gas mixture for the p-SiOx layer growth.
关键词： field-effect passivation,silicon heterojunction solar cells,p-type nanocrystalline silicon-oxide,optical and electrical properties,carbon-dioxide/silane flow rate ratio
更新于2025-09-11 14:15:04
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Minimizing non-radiative recombination losses in perovskite solar cells
摘要： Photovoltaic solar cells based on metal-halide perovskites have gained considerable attention over the past decade because of their potentially low production cost, earth-abundant raw materials, ease of fabrication and ever-increasing power-conversion efficiencies of up to 25.2%. This type of solar cells offers the promise of generating electricity at a more competitive unit price than traditional fossil fuels by 2035. Nevertheless, the best research-cell efficiencies are still below the theoretical limit defined by the Shockley–Queisser theory, owing to the presence of non-radiative recombination losses. In this Review, we analyse the predominant pathways that contribute to non-radiative recombination losses in perovskite solar cells and evaluate their impact on device performance. We then discuss how non-radiative recombination losses can be estimated through reliable characterization techniques and highlight some notable advances in mitigating these losses, which hint at pathways towards defect-free perovskite solar cells. Finally, we outline directions for future work that will push the efficiency of perovskite solar cells towards the radiative limit.
关键词： defect passivation,photovoltaic,perovskite solar cells,Shockley–Queisser theory,non-radiative recombination losses
更新于2025-09-11 14:15:04
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High-performance and -stability graphene quantum dots-mixed conducting polymer/porous Si hybrid solar cells with titanium oxide passivation layer
摘要： Recently, conducting polymer/Si hybrid solar cells (HSCs) based on simple fabrication processes are highly attractive due to their low cost, but low conductivity of the polymer, high reflection index of Si, and large recombination loss on the Si back contact are major drawbacks that should be solved for the practical applications. Here, we first report HSCs composed of graphene quantum dots (GQDs)-mixed poly (3,4-ethylenedioxythiophene) (PEDOT:GQDs)/porous Si (PSi)/n-Si/titanium oxide (TiOx, back passivation layer). Maximum power conversion efficiency (PCE) of 10.49 % is obtained from the HSCs at an active area of 5 mm2, resulting from the enhanced conductivity of the PEDOT:GQDs, the reduced reflectivity of Si (the increased absorption) by the formation of PSi, and the prevented recombination loss at the Si backside due to the passivation. In addition, the HSCs of 16 mm2 active area maintain ~78 % (absolutely from 8.03 to 6.28 %) of the initial PCE even while kept under ambient conditions for 15 days.
关键词： conducting polymer,passivation,hybrid solar cell,titanium oxide,porous Si,reflectivity,graphene quantum dot
更新于2025-09-11 14:15:04
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P‐13.8: Influences of Passivation Hole Etching on the ITO and Metal Contact for Bottom Emission AMOLED Display
摘要： A top-gate self-aligned a-IGZO TFT backplate with white OLED and color filter was demonstrated in this paper. Three kind of PV (passivation) hole etching sequences noted as case 1~3, were studied to verify the contact between ITO and Source/Drain electrode. For case 3, PV hole etching process after PLN patterning shows smooth metal surface and excellent panel performance. In contrast, Sourse and Drain metal corrosion occurred due to non-uniform PV film deposition in other two cases , resulting in bad contact between ITO and S/D metal and poor panel performance.
关键词： COA,corrosion,Passivation Hole Etching
更新于2025-09-11 14:15:04
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Improving Photovoltaic Performance by Using Perovskite/Surface Modified Graphitic Carbon Nitride Heterojunction
摘要： Passivation strategies were considered as one of the most efficient methods to suppress non-radiative recombination of organic-inorganic lead halide perovskite solar cells (PSCs), then, as well as, were widely employed as passivation agents, according to the previous reports. Anchoring g-leading to tremendous photovoltaic performance. An innovative 2D polymer, graphitic carbon nitride (g-C3N4), as well as various organic groups (amino, sulfonic, nitrato and hydroxy group) leading to tremendous photovoltaic performance. C3N4 and the aforementioned organic groups as additives in perovskite could both heal charged defects around the grain boundaries by passivating the charge recombination center. Besides, the crystalline quality could also be enhanced by the incorporation of g-C3N4, leading to improved conductivity of perovskite light absorber films that is beneficial for benign charge extraction efficiency. Inspiring of the underlining mechanisms, we designed a series of novel passivation molecules, functionalized g-C3N4 (F-C3N4) with assorted organic groups, yielding to champion power conversion efficiency (PCE) of 20.08% for NO3-C3N4 based p-i-n structure PSC, in comparison with that of PSC without passivation (17.85%). These findings presented an efficient strategy to understand and design multiple facets of applications of novel passivation molecules to further improve the PCE of PSCs.
关键词： passivation,graphitic carbon nitride,perovskite solar cells,organic groups,photovoltaic performance
更新于2025-09-11 14:15:04
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Manipulation of Phase-Transfer Ligand-Exchange Dynamics of PbS Quantum Dots for Efficient Infrared Photovoltaics
摘要： Chemical surface treatment of colloidal quantum dots (CQDs) by phase-transfer ligand exchange (PTLE) is essential to implement highly densified, well-passivated CQD films for optoelectronic applications, such as infrared photovoltaics, light-emitting diodes and photodetectors. The PTLE, however, involves parallel and interactional processes of ligand exchange, phase transfer, and surface passivation of CQDs, which renders the optimization of PTLE still challenging. Herein, we explored the action mechanism of a widely-used additive, ammonium acetate (AA), on the PTLE of PbS CQDs in order to recognize the dynamic balance during the PTLE process and its impact on the performance of colloidal quantum dot solar cells (CQDSCs). Our research definitely shows that AA additive can modify the dynamics of PTLE by participating in all the three processes, and the amount of AA significantly influences the defect passivation and colloidal stability of PbS CQDs. At an appropriate concentration (~50 mM) of AA, PbS CQDs are well iodide-passivated by the PTLE, and the fabricated CQDSCs achieve the PCE of ~10% associated with the improved carrier transport and the reduced trap-assisted carrier recombination. However, excessive AA causes the trace residual AA on the CQD surface, resulting in the insufficient surface passivation of PbS CQDs and trap issues of CQDSCs. The double-edged sword effect of AA additive on the PTLE, demonstrated in our work, suggests that realizing the dynamic balance of different processes during PTLE is crucial for the further performance promotion of CQDSCs.
关键词： infrared photovoltaics,ammonium acetate,phase-transfer ligand exchange,colloidal quantum dots,surface passivation
更新于2025-09-11 14:15:04
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Insights into Fullerene Passivation of SnO <sub/>2</sub> Electron Transport Layers in Perovskite Solar Cells
摘要： Interfaces between the photoactive and charge transport layers are crucial for the performance of perovskite solar cells. Surface passivation of SnO2 as electron transport layer (ETL) by fullerene derivatives is known to improve the performance of n–i–p devices, yet organic passivation layers are susceptible to removal during perovskite deposition. Understanding the nature of the passivation is important for further optimization of SnO2 ETLs. X-ray photoelectron spectroscopy depth profiling is a convenient tool to monitor the fullerene concentration in passivation layers at a SnO2 interface. Through a comparative study using [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and [6,6]-phenyl-C61-butyric acid (PCBA) passivation layers, a direct correlation is established between the formation of interfacial chemical bonds and the retention of passivating fullerene molecules at the SnO2 interface that effectively reduces the number of defects and enhances electron mobility. Devices with only a PCBA-monolayer-passivated SnO2 ETL exhibit significantly improved performance and reproducibility, achieving an efficiency of 18.8%. Investigating thick and solvent-resistant C60 and PCBM-dimer layers demonstrates that the charge transport in the ETL is only improved by chemisorption of the fullerene at the SnO2 surface.
关键词： solar cell,fullerene,metal halide perovskite,tin oxide,passivation
更新于2025-09-11 14:15:04
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Influence of Interfacial Traps on the Operating Temperature of Perovskite Solar Cells
摘要： In this paper, by developing a mathematical model, the temperature of PSCs under different operating conditions has been calculated. It is found that by reducing the density of tail states at the interfaces through some passivation mechanisms, the operating temperature can be decreased significantly at higher applied voltages. The results show that if the density of tail states at the interfaces is reduced by three orders of magnitude through some passivation mechanisms, then the active layer may not undergo any phase change up to an ambient temperature 300 K and it may not degrade up to 320 K. The calculated heat generation at the interfaces at different applied voltages with and without passivation shows reduced heat generation after reducing the density of tail states at the interfaces. It is expected that this study provides a deeper understanding of the influence of interface passivation on the operating temperature of PSCs.
关键词： interface passivation,perovskite solar cells,degradation,operating temperature
更新于2025-09-11 14:15:04
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Additive Engineering for Efficient and Stable Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have reached a certified 25.2% efficiency in 2019 due to their high absorption coefficient, high carrier mobility, long diffusion length, and tunable direct bandgap. However, due to the nature of solution processing and rapid crystal growth of perovskite thin films, a variety of defects can form as a result of the precursor compositions and processing conditions. The use of additives can affect perovskite crystallization and film formation, defect passivation in the bulk and/or at the surface, as well as influence the interface tuning of structure and energetics. Here, recent progress in additive engineering during perovskite film formation is discussed according to the following common categories: Lewis acid (e.g., metal cations, fullerene derivatives), Lewis base based on the donor type (e.g., O-donor, S-donor, and N-donor), ammonium salts, low-dimensional perovskites, and ionic liquid. Various additive-assisted strategies for interface optimization are then summarized; additives include modifiers to improve electron- and hole-transport layers as well as those to modify perovskite surface properties. Finally, an outlook is provided on research trends with respect to additive engineering in PSC development.
关键词： perovskite solar cells,additives,stability,Lewis acid,defect passivation
更新于2025-09-11 14:15:04
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Phosphate-passivated SnO2 Electron Transport Layer for High Performance Perovskite Solar Cells
摘要： Tin oxide (SnO2) is widely used in perovskite solar cells (PSCs) as an electron transport layer (ETL) material. However, its high surface trap density has already become a strong factor of limiting PSC development. In this work, phosphoric acid is adopted to eliminate the SnO2 surface dangling bonds to improve electron collection efficiency. The phosphorus mainly exists at the boundaries in the form of chained phosphate groups, bonding with which more than 47.9% of Sn dangling bonds are eliminated. The reduction of surface trap states depresses the electron transport barriers, thus the electron mobility increases about 3 times when the concentration of phosphoric acid is optimized with 7.4 at% in the SnO2 precursor. Furthermore, the stability of the perovskite layer deposited on the phosphate-passivated SnO2 (P-SnO2) ETL is gradually improved with the increase of the concentration. Due to the higher electron collection efficiency, the P-SnO2 ETLs can dramatically promote the power conversion efficiency (PCE) of the PSCs. As a result, the champion PSC has a PCE of 21.02%. Therefore, it has been proved that this simple method is efficiently to improve the quality of ETL for high performance PSCs.
关键词： electron transport layer,phosphate passivation,tin oxide,perovskite solar cell,electron collection efficiency
更新于2025-09-11 14:15:04