Enhanced broadband and omnidirectional performance of Cu(In,Ga)Se2 solar cells with ZnO functional nanotree arrays

Hsieh, Ming‐Li; Kuo, Shou‐Yi; Han, Hau-Vei; Yang, Jui‐Fu; Liao, Yu-Kuang; Lai, Fang‐I; Kuo, Hao‐Chung

doi:10.1039/c3nr34079a

Cited by 21 publications

(20 citation statements)

References 33 publications

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“…Besides, SiO 2 and ZnO nanoarray structures were also directly fabricated on the surface of solid solar cells as effective antireflective coatings. 37,38,52,56,117 ZnO nanoforest, 122 have been fabricated to improve the photo absorption, but the photo conversion efficiency remains to be increased. In the following research, the study on hierarchical nanoarrays and nanoarray-nanoparticle complex structures with good AR property, large surface area, and good conductivity, should be emphasized to improve the efficiency of liquid-junction solar cells.…”

Section: Solar Cellsmentioning

confidence: 99%

Recent advances in antireflective surfaces based on nanostructure arrays

2015

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Reducing the reflection and improving the transmission or absorption of light from wide angles of incidence in a broad wavelength range are crucial for enhancing the performance of the optical, optoelectronic, and electro-optical devices. Inspired by the structures of the insect compound eyes, nanostructure arrays (NSAs) have been developed as effective antireflective surfaces, which exhibit promising broadband and quasi-omnidirectional antireflective properties together with multifunctions. This review summarizes the recent advances in the fabrication and performance of antireflective surfaces based on NSAs of a wide variety of materials including silicon and non-silicon materials. The applications of the NSA-based antireflective surfaces in solar cells, light emitting diodes, detection, and imaging are highlighted. The remaining challenges along with future trends in NSA-based antireflective surfaces are also discussed.

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Section: Solar Cellsmentioning

confidence: 99%

Recent advances in antireflective surfaces based on nanostructure arrays

2015

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“…The gradient refractive index profiles, contributed by the subwavelength structure, have been numerically simulated [7,14]. Nevertheless, the refractive index varied through the ZnO NR can be further explored.…”

Section: Optical Analyses For Zno Nanorods Structuresmentioning

confidence: 99%

“…However, before being excited in the absorber, photons experience an optical loss due to the refractive index difference at the interface between air (refractive index, n = 1) and the AZO window layer (n > 1) of the device. This optical loss, induced by surface reflection, is one of the loss factors in energy conversion [7,8]. Efficiency-boosting techniques such as antireflection coatings to increase incident photons are highly desired.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic electrical properties of aqueous grown ZnO antireflective nanostructure on Cu(In,Ga)Se_2 thin film solar cells

Wang¹,

Lin²,

Liu³

et al. 2013

Opt. Express

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A solution-grown subwavelength antireflection coating has been investigated for enhancing the photovoltaic efficiency of thin film solar cells. The 100-nm-height ZnO nanorods coating benefited the photocurrent of Cu(In,Ga)Se2 solar cells from 31.7 to 34.5 mA/cm2 via the decrease of surface light reflectance from 14.5% to 7.0%, contributed by the gradual refractive index profile between air and AZO window layer. The further reduction of surface reflectance to 2.3% in the case of 540-nm-height nanorods, yet, lowered the photocurrent to 29.5 mA/cm2, attributed to the decrease in transmittance. The absorption effect of hydrothermal grown ZnO nanorods was explored to optimize the antireflection function in enhancing photovoltaic performances.

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“…[4,5] Compared with disordered nanoparticle films, one-dimensional ZnO (e.g., nanofibers, nanorods, nanowires, and nanotubes) ordered arrays are superior in photoelectrochemical performance because the highly decreased internal crystalline contacts and vectorial charge transport along the axis of ZnO arrays considerably reduce the electron-hole pair recombination possibilities. [6] Among various ZnO synthesis strategies, hydrothermal growth of ZnO nanorods (ZnR) is the most extensively investigated technique [6,7]; this strategy results in an array of close-packed vertically aligned rods.…”

Section: Introductionmentioning

confidence: 99%