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Theoretical investigation of broadband absorption enhancement in a-Si thin-film solar cell with nanoparticles
摘要： Thin-film solar cells have attracted increasing attention due to its low material cost and large flexibility, but they also face the challenge of low solar absorption due to reduced active layer thickness. Through exciting surface plasmon resonance, plasmonic metal nanoparticles are usually placed on the cell front surface to enhance solar absorption. However, if eliminating the unuseful intrinsic absorption in nanoparticles, we find that dielectric ones are better choices to enhance a-Si thin-film solar cell absorption efficiency. Moreover, a composite light trapping structure with dielectric nanoparticles on the front surface and metal hemispheres on the rear surface is proposed to achieve broadband absorption enhancement in both short and long wavelengths, with the aim to get a higher conversion efficiency. The finite-difference-time-domain simulation results show that, compared with bare 100-nm-thick amorphous silicon solar cell, the short-circuit current density and photoelectric conversion efficiency could be respectively improved by 21% and 18% with addition of optimized composite light trapping structure. The general method proposed in this study could provide valuable guidance to light trapping structure design for various kinds of thin-film solar cells.
关键词： Broadband absorption enhancement,Thin-film solar cell,Light trapping,Conversion efficiency,Amorphous silicon,Nanoparticle
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Control of Texture Size on As-Cut Crystalline Silicon by Microparticle-Assisted Texturing (MPAT) Process
摘要： The texture size on as-cut crystalline silicon (c-Si) is drastically reduced from ~22 μm to <2.7 μm when mixing glass microparticles with conventional alkaline texturing solutions. The processing time and c-Si loss are considerably reduced from >15 to ~3 min and from >8 to 2 μm (for one side), respectively. Thus, this process is applicable to very thin c-Si. High-quality surface passivation with the effective minority carrier lifetimes >7 ms, corresponding to surface recombination velocity of 0.38 cm/s was possible. After anti-reflection coating, the reflectivity ~0.4% at 600nm, and <2% in wide wavelength 450?950nm was achieved on this new texture.
关键词： photovoltaic cells,light trapping,charge carrier lifetime,etching,cleaning,silicon,chemical processes
更新于2025-09-19 17:13:59
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Efficiency Enhancement of Ultra-thin CIGS Solar Cells Using Bandgap Grading and Embedding Au Plasmonic Nanoparticles
摘要： The objective of this study is to enhance the efficiency of copper indium gallium selenide (CIGS) solar cells. To accomplish that, composition grading of absorber layer was carried out by using SILVACO’s technology aided computer design (TCAD) ATLAS program. Results showed a meaningful improvement of output parameters including open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF), and power conversion efficiency (η). For further performance improvement of the cell, Au plasmonic scattering nanoparticles were loaded on the top of the ZnO window layer. Plasmonic nanoparticles can restrict, absorb, navigate, or scatter the incident light. By using the spherical Au nanoparticles, a very good increase in the light absorption in the cell over the reference planar CIGS solar cell was observed. The highest η = 19.01% was achieved for the designed ultra-thin bandgap-graded CIGS solar cell decorated by Au nanoparticles.
关键词： Surface plasmon,CIGS,Bandgap grading,FDTD,Light trapping
更新于2025-09-19 17:13:59
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Coupling and Trapping of Light in Thin-Film Solar Cells Using Modulated Interface Textures
摘要： Increasing the e?ciency of solar cells relies on light management. This becomes increasingly important for thin-?lm technologies, but it is also relevant for poorly absorbing semiconductors like silicon. Exemplarily, the performance of a-Si:H/μc-Si:H tandem solar cells strongly depends on the texture of the front and rear contact surfaces. The rear contact interface texture usually results from the front surface texture and the subsequent absorber growth. A well-textured front contact facilitates light-coupling to the solar cell and light-trapping within the device. A variety of di?erently textured ZnO:Al front contacts were sputter deposited and subsequently texture etched. The optical performance of a-Si:H/μc-Si:H tandem solar cells were evaluated regarding the two e?ects: light-coupling and light-trapping. A connection between the front contact texture and the two optical e?ects is demonstrated, speci?cally, it is shown that both are induced by di?erent texture properties. These ?ndings can be transferred to any solar cell technologies, like copper indium gallium selenide (CIGS) or perovskites, where light management and modi?cations of surface textures by subsequent ?lm growth have to be considered. A modulated surface texture of the ZnO:Al front contact was realized using two etching steps. Improved light-coupling and light-trapping in silicon thin-?lm solar cells lead to 12.5% e?ciency.
关键词： thin-?lm solar cell,light-trapping,ZnO:Al,front contact,light-scattering,surface texture,light-coupling
更新于2025-09-16 10:30:52
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Sidewall profile dependent nanostructured ultrathin solar cells with enhanced light trapping capabilities
摘要： Theoretical studies of ultra-thin silicon solar cells with cylindrical, conical and parabolic surface nanostructures inherited from natural self-assembled anodic alumina oxide (NSA-AAO) were performed by finite-difference time-domain (FDTD) method. All nanostructured solar cells obtained an optimized efficiency enhancement as high as more than 33% comparing with that of the anti-reflective (AR) one. Numerical results reveal that the range of efficient structural parameters for the nanostructured (e.g. cylindrical) solar cell can be effectively enlarged as the period of the nanostructure changes from 0.1 μm to 0.5 μm. Moreover, the improvements of absorption photocurrent density (Jph) in conical and parabolic nanostructured solar cells are comparable with the cylindrical nanostructured one but less sensitive to the fill factor and structural height in the whole simulation region of 0.1-0.9 and 0-0.25 μm, respectively. Equivalent refractive index models were used to analysis the antireflection performance of surface nanostructures from the point of view of sidewall profiles. Resonance modes induced through nanostructures have greatly improved the absorptance of solar cells in broadening wavelength bands which consequently raised the Jph. This study serves as a way for the practical design and application of AAO nanostructure based high-efficiency ultra-thin solar cells.
关键词： Solar cell,Nanostructure,Light trapping
更新于2025-09-16 10:30:52
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Random nanohole arrays and its application to crystalline Si thin foils produced by proton induced exfoliation for solar cells
摘要： We report high efficiency cell processing technologies for the ultra-thin Si solar cells based on crystalline Si thin foils (below a 50 μm thickness) produced by the proton implant exfoliation (PIE) technique. Shallow textures of submicrometer scale is essential for effective light trapping in crystalline Si thin foil based solar cells. In this study, we report the fabrication process of random Si nanohole arrays of ellipsoids by a facile way using low melting point metal nanoparticles of indium which were vacuum-deposited and dewetted spontaneously at room temperature. Combination of dry and wet etch processes with indium nanoparticles as etch masks enables the fabrication of random Si nanohole arrays of an ellipsoidal shape. The optimized etching processes led to effective light trapping nanostructures comparable to conventional micro-pyramids. We also developed the laser fired contact (LFC) process especially suitable for crystalline Si thin foil based PERC solar cells. The laser processing parameters were optimized to obtain a shallow LFC contact in conjunction with a low contact resistance. Lastly, we applied the random Si nanohole arrays and the LFC process to the crystalline Si thin foils (a 48 μm thickness) produced by the PIE technique and achieved the best efficiency of 17.1% while the planar PERC solar cell without the Si nanohole arrays exhibit 15.6%. Also, we demonstrate the ultra-thin wafer is bendable to have a 16 mm critical bending radius.
关键词： proton implant exfoliation,random Si nanohole arrays,PERC solar cells,ultra-thin Si solar cells,light trapping,laser fired contact
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Improved Photoabsorption in Thin Gallium Arsenide Solar Cells using Light Trapping Techniques
摘要： Thin absorbers for space photovoltaics can achieve higher radiation tolerance, however, they suffer from reduced photoabsorption as the active region is thinned. In this work, increasing the photoabsorption in thin single junction n-i-p GaAs solar cells have been investigated by applying different light trapping structures at the rear of the cell. The main focus has been to develop a random surface texture that varies in three dimensions to increase light scattering and the effective optical path length. From the EQE, the random back surface reflector was successfully applied to a 1.1 μm thick GaAs solar cell which resulted in a notable 38% increase in current output, when compared to the GaAs baseline cell on its substrate without a BSR. The random texture has shown the capability to maintain the current output in the 1.1 μm thick GaAs absorber and shows promise for enhancing the photoabsorption in thin GaAs absorbers that approach the sub-μm thickness regime.
关键词： photoabsorption,thin GaAs solar cells,light trapping,random maskless texture,radiation tolerance
更新于2025-09-16 10:30:52
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Nanostructures for Light Trapping in Thin Film Solar Cells
摘要： Thin ?lm solar cells are one of the important candidates utilized to reduce the cost of photovoltaic production by minimizing the usage of active materials. However, low light absorption due to low absorption coe?cient and/or insu?cient active layer thickness can limit the performance of thin ?lm solar cells. Increasing the absorption of light that can be converted into electrical current in thin ?lm solar cells is crucial for enhancing the overall e?ciency and in reducing the cost. Therefore, light trapping strategies play a signi?cant role in achieving this goal. The main objectives of light trapping techniques are to decrease incident light re?ection, increase the light absorption, and modify the optical response of the device for use in di?erent applications. Nanostructures utilize key sets of approaches to achieve these objectives, including gradual refractive index matching, and coupling incident light into guided modes and localized plasmon resonances, as well as surface plasmon polariton modes. In this review, we discuss some of the recent developments in the design and implementation of nanostructures for light trapping in solar cells. These include the development of solar cells containing photonic and plasmonic nanostructures. The distinct bene?ts and challenges of these schemes are also explained and discussed.
关键词： solar cells,plasmonic nanostructures,light trapping,thin ?lms,photonic nanostructures
更新于2025-09-16 10:30:52
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The light-trapping effect in various textured cover glass for enhancing the current density in silicon heterojunction solar cells
摘要： Light trapping by front surface texturing is considered an important mechanism since it can reduce the reflectance on the surface, enhance the photo-generated charge carriers and hence the performance of solar cells. Since the silicon (p, i, n) layers are deposited after surface texturing that may induce various defects leading to a reduction in open-circuit voltage (Voc) and fill factor (FF). In this study, textured glass surfaces and silicon heterojunction solar cells (HJSCs) were prepared separately. The textured glass surface was optically coupled with the index matching solution (IMS) at the front surface of HJSCs for an enhancement in current density. Three wet chemical textured glass surfaces named Etch 1, Etch 2 and Etch 3 were employed based on various optical properties. It was observed during the current density-voltage (J-V) measurements that Voc and FF of the device did not change. Reference HJSC coupled with flat glass showed J-V characteristic as Voc=726.3 mV, FF=76.62%, Jsc=37.9 mA/cm2, ?=21.09% without IMS. The Jsc of HJSCs coupled with textured glass surface can be further enhanced by using IMS due to better light trapping. HJSCs coupled with textured glass (Etch 2) surface showed the highest Jsc of 38.4 mA/cm2 with an efficiency of 21.4% without IMS whereas it showed an efficiency of 22.41% with Jsc of 40.2 mA/cm2 using IMS. The trends in the external quantum efficiency of the HJSCs indicate that the Jsc can be improved if a suitable index matching solution and glass material are used.
关键词： textured glass,current density,light trapping,index matching solution,Solar cell
更新于2025-09-16 10:30:52
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Broad spectrum light-trapping ternary polymer solar cells based on self-assembled nano-ridged active layer
摘要： Ternary blend polymer solar cells (TPSCs) comprising one donor and two fullerene acceptors is efficient method for improving the power conversion efficiency (PCE). In this paper, the PTB7-Th-based TPSCs which is incorporating PC70BM and PC60BM as mixed acceptors are fabricated and investigated. Impressively, the remarkable self-assembled nano-ridged (SANR) structures are discovered in the active layer with the weight ratio of 50% PC60BM in fullerenes. Thanks to the enlarged interface area, enhanced light absorption and balanced carrier transport, the PTB7-Th:PC70BM:PC60BM TPSCs with the SANR active layer gives an optimal PCE of 9.68%. In addition, it is worth emphasizing that by combining the textured-ZnO with the SANR active layer, a double ridge superimposed system (DRSS) with broad spectrum light trapping characteristic is constructed, which can further enhance the light absorption of the devices. Finally, benefiting from the further increase in short circuit current density (Jsc), the PTB7-Th:PC70BM:PC60BM TPSCs with the DRSS gives an optimal PCE of 10.68%. This work provides a feasible ternary strategy to increase the devices performances and is proved be a simple and efficient strategy for fabricating PTB7-Th:PC70BM:PC60BM TPSCs with SANR active layer.
关键词： Self-assembled nano-ridged structure,Ternary polymer solar cell,Broad spectrum light trapping,Double ridge superimposed system
更新于2025-09-16 10:30:52