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light trapping characteristics of glass substrate with hemisphere pit arrays in thin film Si solar cells

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Chinese Physics B 2015年第4期24卷 16-21页

作者：陈乐王庆康王阳培华黄堃沈向前 Key Laboratory for Thin Film and Micro-fabrication of the Ministry of Education Department of Microelectronics and NanoscienceShanghai Jiao Tong University College of Physical Science and Technology Engineering Guangxi Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal University

In this paper, the light trapping characteristics of glass substrate with hemisphere pit （HP） arrays in thin film Si solar cells are theoretically studied via a numerical approach. It is found that the HP glass substrate has good antireflection properties. Its surface reflectance can be reduced by - 50% compared with planar glass. The HP arrays can make the unabsorbed light return to the absorbing layer of solar cells, and the ratio of second absorption approximately equals 30%. Thus, the glass substrate with the hemisphere pit arrays （HP glass） can effectively reduce the total reflectivity of a solar celt from 20% to 13%. The lip glass can also prolong the optical path length. The numerical results show that the total optical path length of the thin film Si solar cell covered with the HP glass increases from 2ω to 409. These results are basically consistent with the experimental results.

关键词： numerical approach light trapping hemispherical pit (HP) optical path length solar cells

Enhanced light trapping in periodically truncated cone silicon nanowire structure

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Journal of Semiconductors 2015年第10期36卷 69-73页

作者：邱凯左玉华周天微刘智郑军李传波成步文 State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

light trapping plays an important role in improving the conversion efficiency of thin-film solar cells. The good wideband light trapping is achieved using our periodically truncated cone Si nanowire （NW） structures, and their inherent mechanism is analyzed and simulated by FDTD solution software. Ordered cylinder Si NW structure with initial size orS0 nm and length of 200 nm is grown by pattern transfer and selective epitaxial growth. Truncated cone Si NW array is then obtained by thermal oxidation treatment. Its mean reflection in the range of 300-900 nm is lowered to be 5% using 140 nm long truncated cone Si NW structure, compared with that of 20% using cylinder counterparts. It indicates that periodically truncated Si cone structures trap the light efficiently to enhance the light harvesting in a wide spectral range and have the potential application in highly efficient NW solar cells.

关键词： silicon film solar cells AAO template nanowires light trapping

Metallic nanostructures for light trapping in energy-harvesting devices

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light(Science & Applications) 2014年第1期3卷 231-242页

作者： Chuan Fei Guo Tianyi Sun Feng Cao Qian Liu Zhifeng Ren Department of Physics and TcSUH University of HoustonHoustonTX 77204USA National Center for Nanoscience and Technology of China Beijing 100190China

Solar energy is abundant and environmentally *** trapping in solar-energy-harvesting devices or structures is of critical *** article reviews light trapping with metallic nanostructures for thin film solar cells and selective solar *** metallic nanostructures can either be used in reducing material thickness and device cost or in improving light absorbance and thereby improving conversion *** metallic nanostructures can contribute to light trapping by scattering and increasing the path length of light,by generating strong electromagnetic field in the active layer,or by multiple reflections/*** have also discussed the adverse effect of metallic nanostructures and how to solve these problems and take full advantage of the light-trapping effect.

关键词： conversion efficiency light trapping photovoltaics plasmonics solar absorber

Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

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light(Science & Applications) 2016年第1期5卷 855-861页

作者： Barbara Fazio Pietro Artoni Maria Antonia Iatì Cristiano D’Andrea Maria JosèLo Faro Salvatore Del Sorbo Stefano Pirotta Pietro Giuseppe Gucciardi Paolo Musumeci Cirino Salvatore Vasi Rosalba Saija Matteo Galli Francesco Priolo Alessia Irrera CNR-IPCF Istituto per i Processi Chimico Fisici98158 MessinaItaly Dipartimento di Fisica e Astronomia Universitàdi Catania95123 CataniaItaly CNR-MATIS IMM Istituto per la Microelettronica e Microsistemi95123 CataniaItaly Dipartimento di Fisica Universitàdegli Studi di Pavia27100 PaviaItaly Dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della TerraUniversitàdi Messina98166 MessinaItaly Scuola Superiore di Catania Universitàdi Cataniavia Valdisavoia995123 CataniaItaly

We report on the unconventional optical properties exhibited by a two-dimensional array of thin Si nanowires arranged in a random fractal geometry and fabricated using an inexpensive,fast and maskless process compatible with Si *** structure allows for a high light-trapping efficiency across the entire visible range,attaining total reflectance values as low as 0.1%when the wavelength in the medium matches the length scale of maximum heterogeneity in the *** show that the random fractal structure of our nanowire array is responsible for a strong in-plane multiple scattering,which is related to the material refractive index fluctuations and leads to a greatly enhanced Raman scattering and a bright *** strong emissions are correlated on all length scales according to the refractive index *** relevance and the perspectives of the reported results are discussed as promising for Si-based photovoltaic and photonic applications.

关键词： light trapping multiple scattering Raman enhancement random fractal silicon nanowires

Intermittent chaos for ergodic light trapping in a photonic fiber plate

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light(Science & Applications) 2016年第1期5卷 209-215页

作者： Marina Mariano Gregory Kozyreff Luis G Gerling Pablo Romero-Gomez Joaquim Puigdollers Jorge Bravo-Abad Jordi Martorell ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)08860Spain Département de Physique UniversitéLibre de Bruxelles(ULB)Campus de la PlaineBruxelles B-1050Belgium Departament Enginyeria Electrònica Universitat Politècnica de CatalunyaBarcelona 08034Spain Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autónoma de MadridMadrid 28049Spain Departament de Física Universitat Politècnica de CatalunyaTerrassa 08222Spain

Extracting the light trapped in a waveguide,or the opposite effect of trapping light in a thin region and guiding it perpendicular to its incident propagation direction,is essential for optimal energetic performance in illumination,display or light harvesting *** we demonstrate that the paradoxical goal of letting as much light in or out while maintaining the wave effectively trapped can be achieved with a periodic array of interpenetrated fibers forming a photonic fiber *** entering perpendicular to that plate may be trapped in an intermittent chaotic trajectory,leading to an optically ergodic *** fabricated such a photonic fiber plate and showed that for a solar cell incorporated on one of the plate surfaces,light absorption is greatly *** this,we found the unexpected result that a more chaotic photon trajectory reduces the production of photon scattering entropy.

关键词： chaos ergodicity fiber light-guiding plate light harvesting light trapping

Plasmonic light trapping for enhanced light absorption in film-coupled ultrathin metamaterial thermophotovoltaic cells

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Frontiers in Energy 2018年第1期12卷 185-194页

作者： Qing NI Hassan ALSHEHRI Yue YANG Hong YE Liping WANG School for Engineering of Matter Transport & Energy Arizona StateUniversity Tempe AZ 85287 USA Department of Thermal Scienceand Energy Engineering University of Science and Technology ofChina Hefei 230027 China School of Mechanical Engineering and Automation Harbin Institute of Technology (Shenzhen) Shenzhen518052 China Department of Thermal Science and Energy Engineering University ofScience and Technology of China Hefei 230027 China

Ultrathin cells have gained increasing attention due to their potential for reduced weight, reduced cost and increased flexibility. However, the light absorption in ultrathin cells is usually very weak compared to the corresponding bulk cells. To achieve enhanced photon absorption in ultrathin thermophotovoltaic （TPV） cells, this work proposed a film-coupled metamaterial structure made of nanometer-thick gallium antimonide （GaSh） layer sandwiched by a top one-dimensional （1D） metallic grating and a bottom metal film. The spectral normal absorptance of the proposed structure was calculated using the rigorous coupled-wave algorithm （RCWA） and the absorption enhancement was elucidated to be attributed to the excitations of magnetic polariton （MP）, surface plasmon polariton （SPP）, and Fabry-Perot （FP） resonance. The mechanisms of MP, SPP, and FP were further confirmed by an inductor-capacitor circuit model, disper- sion relation, and phase shift, respectively. Effects of grating period, width, spacer thickness, as well as incidence angle were discussed. Moreover, short-circuit current density, open-circuit voltage, output electric power,and conversion efficiency were evaluated for the ultrathin GaSb TPV cell with a film-coupled metamaterial structure. This work will facilitate the development of next- generation low-cost ultrathin infrared TPV cells.

关键词： metamaterial thermophotovoltaic plasmo-nics light trapping selective absorption

Highly efficient organic solar cells enabled by a porous ZnO/PEIE electron transport layer with enhanced light trapping

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Science China Materials 2021年第4期64卷 808-819页

作者： Shenya Qu Jiangsheng Yu Jinru Cao Xin Liu Hongtao Wang Shun Guang Weihua Tang MIIT Key Laboratory of Advanced Solid Laser Nanjing University of Science and TechnologyNanjing 210094China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

In this study,a porous inorganic/organic(ZnO/PEIE,where PEIE is polyethylenimine ethoxylated)(P-ZnO)hybrid material has been developed and adopted in the inverted organic solar cells(OSCs).The P-ZnO serving as the electron transport layer(ETL)not only presents an ameliorative work function,but also forms the cratered surface with increased ohmic contact area,revealing suppressed charge recombination and enhanced charge extraction in ***,P-ZnO-based OSCs show improved light trapping in the active layer compared with ZnO-based *** universality of P-ZnO serving as ETL for efficient OSCs is verified on three photovoltaic systems of PBDB-T/DTPPSe-2 F,PM6/Y6,and PTB7-Th/PC_(71)*** enhancements of 8%in power conversion efficiency(PCE)can be achieved in the state-of-the-art OSCs based on PBDB-T/DTPPSe-2F,PM6/Y6,and PTB7-Th/PC_(71)BM,delivering PCEs of 14.78%,16.57%,and 9.85%,***,a promising PCE of14.13%under air-processed condition can be achieved for PZnO/PBDB-T/DTPPSe-2F-based OSC,which is among the highest efficiencies reported for air-processed OSCs in the *** the P-ZnO/PBDB-T/DTPPSe-2F-based device also presents superior long-term storage stability whether in nitrogen or ambient air-condition without encapsulation,which can maintain over 85%of its initial *** results demonstrate the great potential of the porous hybrid PZnO as ETL for constructing high-performance and air-stable OSCs.

关键词： light trapping electron transport layer porous structure stability organic solar cells

Improving UV stability of perovskite solar cells without sacrificing efficiency through light trapping regulated spectral modification

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Science Bulletin 2021年第23期66卷 2362-2368页

作者： Kaimo Deng Qinghua Chen Ying Shen Liang Li School of Physical Science and Technology Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

The stability of perovskite solar cells is an important issue to be addressed for future *** solar cells are vulnerable to exposure to UV light due to promoted chemical ***, preventing UV light from entering solar cells lowers the power conversion efficiency by reducing the photocurrent. The challenge is to improve UV stability without sacrificing efficiency. Here, we demonstrate the reduction of UV light-related negative effects from the perspective of spectral modification. By simultaneously introducing UV–visible downshifting and light trapping, perovskite solar cells can achieve a comparable efficiency of over 21% to that of an unmodified device. The optimized device obtains increased UV stability due to UV–visible downshifting. Different from other strategies, spectral modification externally alters the composition of incident light and improves UV stability without changing the internal device architecture, which is broadly applicable to perovskite solar cells with different structures. The present work may also find applications in other types of solar cells to boost the stability of devices exposed to UV light.

关键词： UV stability Perovskite solar cells Downshifting light trapping

Beyond Lambertian light trapping for large-area silicon solar cells:fabrication methods

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Opto-Electronic Advances 2022年第9期5卷 14-25页

作者： Jovan Maksimovic Jingwen Hu Soon Hock Ng Tomas Katkus Gediminas Seniutinas Tatiana Pinedo Rivera Michael Stuiber Yoshiaki Nishijima Sajeev John Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn Vic 3122Australia Melbourne Centre for Nanofabrication ANFF Victoria151 Wellington Rd.Clayton Vic 3168 Australia Department of Electrical and Computer Engineering Graduate School of EngineeringYokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Institute of Advanced Sciences Yokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Department of Physics University of Toronto60 St.George StreetTorontoONM5S 1A7Canada World Research Hub Initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single junction *** is beyond the efficiency limit implied by the Lambertian limit of ray trapping~29%.The interference and slow light effects are harnessed for collecting light even at the long wavelengths near the Si *** compare two different methods for surface patterning,that can be extended to large area surface patterning:1)laser direct write and 2)step-&-repeat 5×reduction projection *** area throughput limitations of these methods are compared with the established elec-tron beam lithography(EBL)route,which is conventionally utilised but much slower than the presented ***-tral characterisation of the PhC light trapping is compared for samples fabricated by different *** of Si etched via laser patterned mask was~7%at visible wavelengths and was comparable with Si patterned via EBL made *** later pattern showed a stronger absorbance than the Lambertian limit6.

关键词： silicon solar cells laser ablation light trapping Lambertian limit