The micro-optic photovoltaic behavior of solar cell along with microlens curved glass substrate

Xie, Jianhe; Wu, K.K.; Cheng, Jian; Li, Ping; Zheng, Jiehui

doi:10.1016/j.enconman.2015.03.006

Cited by 19 publications

(9 citation statements)

References 15 publications

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“…Still, semitransparent solar cells show lower efficiencies than their opaque counterparts due to the inherent tradeoff between transmission and absorption. To overcome this problem different light trapping approaches such as microcavities, dielectric scatters, microlenses, and wavelength selective mirrors have been investigated . Particularly the last approach allows to precisely adjust the transparency as well as the color of a device.…”

Section: Introductionmentioning

confidence: 99%

Printable Dielectric Mirrors with Easily Adjustable and Well‐Defined Reflection Maxima for Semitransparent Organic Solar Cells

Bronnbauer

Hornich

Gasparini

et al. 2015

Advanced Optical Materials

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spectrum to a desired color by the use of different photoactive materials. [2][3][4][5][6] These characteristics enable the production of power generating smart windows, awnings, building facades etc. [7][8][9] Still, semitransparent solar cells show lower effi ciencies than their opaque counterparts due to the inherent tradeoff between transmission and absorption. To overcome this problem different light trapping approaches such as microcavities, dielectric scatters, microlenses, and wavelength selective mirrors have been investigated. [10][11][12][13][14][15][16][17][18][19] Particularly the last approach allows to precisely adjust the transparency as well as the color of a device. Wavelength selective fi lters are also known as 1D photonic crystals, Bragg mirrors or dielectric mirrors (DMs). The working principle of DMs relies on constructive or destructive interference of thin layers. For this purpose, a high refractive index (HRI) and a low refractive index (LRI) material have to be arranged alternatingly and fulfi ll the equation 4 HRI HRI LRI LRI 0 n d n d λ = = , with n being the refractive index (RI), d being the layer thickness, and λ 0 being the wavelength with maximum refl ection at perpendicular incidence. An high RI contrast is desirable as this leads to a broad stopband with a large refl ection at λ 0 . [ 20 ] The production of a DM, however, is challenging as only slight variations in layer thicknesses cause a shift in λ 0 (see Figure S1, Supporting Information). Conventional techniques for DM fabrication are evaporation of inorganic materials under high vacuum conditions, electron beam evaporation, and magnetron sputtering. [ 15,16,[21][22][23] However, polymers or organic-inorganic nanocomposites are much more promising because they allow a controlled variation of n , better processability, and highly fl exible fi lms. [24][25][26] Methods such as spin coating or dip coating can be carried out with these ink-based materials. [ 17,24,[27][28][29][30] However, while these techniques allow precise settings in layer thickness, they only offer limited potential with respect to commercial and largearea processing as they are cost-intensive and diffi cult in terms of upscaling. In addition, DMs directly processed on the top of solar cells further complicate the whole device structure. For example, up to 16 additional layers are necessary to increase the short-circuit current ( J sc ) by ≈20% compared to a device without DM. [ 31 ] Building integrated semitransparent thin-fi lm solar cells is a strategy for future eco-friendly power generation. Organic photovoltaics in combination with dielectric mirrors (DMs) are a potential candidate as they promise high effi ciencies in parallel to the possibility to adjust the color and thus the transparency of the whole device. A fully solution processed and printable DM with an easily adjustable refl ection maximum is presented that can be facilely attached to solar cells. The DM is optimized via optical simulations to the particular needs of the device with regar...

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Section: Introductionmentioning

confidence: 99%

Printable Dielectric Mirrors with Easily Adjustable and Well‐Defined Reflection Maxima for Semitransparent Organic Solar Cells

Bronnbauer

Hornich

Gasparini

et al. 2015

Advanced Optical Materials

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“…MLA'nın üretimi mikro elmas tekerlek ve fotolitografi teknikleri gibi çeşitli yöntemler ile yapılmaktadır [7,8,9,10]. Bu yöntemler kaplanan yüzeye, kaplanacak malzemeye ve oluşturulacak yüzey profiline göre değişmektedir.…”

Section: Mla üRetim Yöntemi (Mla Production Method)unclassified

“…Yüzeyden yansımaları engellemek için yüzeye düz plaka şeklinde yansıma önleyici kaplamalar yapılmaktadır. Bu kaplama sonucu yansıma kayıplarının %1'in altına indiği belirtilmektedir [7]. Düz plaka yansıma önleyici kaplama ile hücrenin performansı artırılmaktadır.…”

Section: Güneş Hücreleri (Solar Cells)unclassified

“…Düz plaka yansıma önleyici kaplama ile hücrenin performansı artırılmaktadır. Ancak ilgili literatürde yansıma önleyici kaplamanın düz olmasından ziyade bir mikro lens yüzey profiline sahip olması performansı daha da artırdığı ifade edilmektedir [7,8,9,10]. Nam ve arkadaşları yaptıkları çalışmada MLA ile kaplanan güneş hücresinin performansının düz plaka şeklindeki kaplamanın performansına göre %18,5 oranında arttığını belirtmişlerdir [8].…”

Section: Güneş Hücreleri (Solar Cells)unclassified

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Uydu Güç Sistemlerindeki Güneş Hücrelerine Yönelik Uzay Kalifiye Mikro Lens Dizilerin Geliştirilmesi

Keser

Yenisoy

İdare

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Uydunun ana sistemlerinden olan güç sistemi uydu için gerekli enerjiyi sağlamaktadır. Güç sisteminde en çok kullanılan enerji kaynağı ise güneş hücreleridir. En yüksek performansa sahip güneş hücrelerinin üçüncü nesil çok eklemli güneş hücreleri olduğu bilinmektedir. Güneş hücrelerinin performanslarının artırılmasında kullanılan çeşitli yöntemlerden birisi de Mikro Lens Dizileri-MLA ile yansıma önleyici yüzey kaplamalarıdır. Uydu teknolojilerinde gerekli enerjinin yüksek verimde elde edilmesi ve ilgili kaynağın düşük kütlede olması beklenmektedir. Uzay ortamı radyasyon, atomik oksijen ve ısıl döngü gibi birbirinden farklı pek çok etkeni içermektedir. Yapılan araştırmalar güneş hücresinin performanslarının geliştirilmesinde kullanılan ışığı soğurma etkinliğinin artırıldığı MLA kaplamalarda, hücre ısısının artmadığını ve bunların hücreye yok denecek kadar az ağırlık getirdiğini göstermektedir. Ancak güneş hücrelerinin MLA ile kaplanması üzerine yapılan az sayıdaki çalışmanın uzay uygulamalarına yönelik olmadığı da tespit edilmiştir. Bu çalışmada uydu güç sistemlerine yönelik MLA'ların geliştirilmesi süreci yöntemsel olarak incelenmektedir. Bu bağlamda tasarlanacak uydu güç sistemleri için çok eklemli güneş hücrelerinin MLA ile kaplamasına dayalı olarak geliştirilen bir yöntem sunulmaktadır.

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“…In order to investigate the weak-light electricity generation of micro-lens array photovoltaic substrate, the illumination intensity L x was set as 500 W/m 2 [16], which was twice less than a standard solar radiation of 1000 W/m 2 .…”

Section: Introductionmentioning

confidence: 99%

Precision and mirror micro-grinding of micro-lens array on macro-freeform glass substrate for micro-photovoltaic performances

Zhang

Xie

Guo

et al. 2015

Int J Adv Manuf Technol

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A hybrid of micro-lens array and freeform surface produces a novel micro-optic and micro-photovoltaic behaviors, but it is difficult to control both micro-form and macroform accuracies in micro-machining of brittle photovoltaic glass. Hence, a ductile micro-grinding is proposed to replicate the precision-trued diamond wheel V-tip on macro-freeform glass substrate of solar cell. The objective is to understand the formation mechanism of accurate micro-lens array on freeform glass surface for photovoltaic application. First, the micro-optic properties of freeform micro-lens array were analyzed with regard to micro-and macro-shapes. Second, the precision and mirror micro-grinding along with the form errors of freeform micro-lens array was observed on the base of the transfer from brittle-mode removal to ductile-mode removal. Finally, the photovoltaic properties were experimentally measured. It is shown that the freeform micro-lens array increases luminous flux by 53.8-54.5 % compared with the plane and micro-lens array. The micro-form accuracy and the micro-structure mirror are dominated by micro-meter-scale diamond wheel V-tip with accurate wheel V-tip profile and integrated micro-grains protrusion, respectively. The novel measuring model of freeform micro-lens array may be used to evaluate and control the curved micro-form accuracy. The freeform micro-lens array contributes to the improvement of photovoltaic performance in scattered light illumination.

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The micro-optic photovoltaic behavior of solar cell along with microlens curved glass substrate

Cited by 19 publications

References 15 publications

Printable Dielectric Mirrors with Easily Adjustable and Well‐Defined Reflection Maxima for Semitransparent Organic Solar Cells

Printable Dielectric Mirrors with Easily Adjustable and Well‐Defined Reflection Maxima for Semitransparent Organic Solar Cells

Uydu Güç Sistemlerindeki Güneş Hücrelerine Yönelik Uzay Kalifiye Mikro Lens Dizilerin Geliştirilmesi

Precision and mirror micro-grinding of micro-lens array on macro-freeform glass substrate for micro-photovoltaic performances

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