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Present Status of Thin Film Solar Cells Using Textured Surfaces: A Brief Review
Hyeongsik Park,SHAIKHMOHAMMAD IFTIQUAR,Anh Huy Tuan Le,Shihyun Ahn,강준영,Yongjun Kim,Junsin Yi,Sunbo Kim,신명훈 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.5
This is a brief review on light trapping in Si based thin film solar cells with textured surfaces and transparentconducting oxide front electrodes. The light trapping scheme appears to be essential in improving device efficiencyover 10%. As light absorption in a thin film solar cells is not sufficient, light trapping becomes necessary to beeffectively implemented with a textured surface. Surface texturing helps in the light trapping, and thereby raises shortcircuit current density and its efficiency. Such a scheme can be adapted to single junction as well as tandem solar cell,amorphous or micro-crystalline devices. A tandem cell is expected to have superior performance in comparison to asingle junction cell and random surface textures appears to be preferable to a periodic structures.
Park, Hyeongsik,Nam, Sang-Hun,Shin, Myunghun,Ju, Minkyu,Lee, Youn-Jung,Yu, Jung-Hoon,Jung, Junhee,Kim, Sunbo,Ahn, Shihyun,Boo, Jin-Hyo American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>We developed a technique for forming textured aluminum-doped zinc oxide (ZnO: Al) transparent conductive oxide (TCO) films on glass substrates, which were etched using a mixture of hydrofluoric (HF) and hydrochloric (HCl) acids. The etching depth and surface roughness increased with an increase in the HF content and the etching time. The HF-based residues produced insoluble hexafluorosilicate anion-and oxide impurity-based semipermeable films, which reduced the etching rate. Using a small amount of HCl dissolved the Ca compounds, helping to fragment the semipermeable film. This formed random, complex structures on the glass substrates. The angled deposition of three layers of ZnO: Al led to the synthesis of multiscaled ZnO: Al textures on the glass substrates. The proposed approach resulted in textured ZnO: Al TCO films that exhibited high transmittance (similar to 80%) and high haze (>40%) values over wavelengths of 400-1000 nm, as well as low sheet resistances (<18 Omega/sq). Si tandem solar cells based on the ZnO: Al textured TCO films exhibited photocurrents and cell efficiencies that were 40% higher than those of cells with conventional TCO films.</P>
Park, Hyeongsik,Shin, Myunghun,Kim, Hyeongseok,Kim, Sunbo,Le, Anh Huy Tuan,Kim, Youngkuk,Ahn, Shihyun,Jeong, Jae-Seong,Yi, Junsin American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>A glass texturing process was developed to enhance the light scattering in the wideband wavelength range for thin-film hydrogenated amorphous silicon solar cells. Periodic honeycomb structures were patterned on glass substrates by a simple photolithography and chemical wet-etching process using HF (10%) solutions. We investigated the optical properties of the textured glasses for various etching times (i.e., the statuses of the etching steps), which were characterized using optical measurements and finite-difference time-domain simulations. We found the reproducible texturing conditions for obtaining high transmittance and haze values, and the angular distribution measurements showed that the scattered light is diffracted and trapped within the solar cell. The textured glass substrates showed a maximum transmittance of 95.5% and a haze ratio of about 61% in the wideband wavelength range, and the finite-difference time-domain simulation expected a very high short-circuit current density of 21.9 mA/cm(2) for a single-junction thin-film hydrogenated amorphous silicon solar cell employing the honeycomb textured glass substrates, which will be useful for developing high-performance thin-film hydrogenated amorphous silicon solar cells.</P>
Present Status of Thin Film Solar Cells Using Textured Surfaces: A Brief Review
Park, Hyeongsik,Iftiquar, S.M.,Le, Anh Huy Tuan,Ahn, Shihyun,Kang, Junyoung,Kim, Yongjun,Yi, Junsin,Kim, Sunbo,Shin, Myunghun The Korean Institute of Electrical and Electronic 2016 Transactions on Electrical and Electronic Material Vol.17 No.5
This is a brief review on light trapping in Si based thin film solar cells with textured surfaces and transparent conducting oxide front electrodes. The light trapping scheme appears to be essential in improving device efficiency over 10%. As light absorption in a thin film solar cells is not sufficient, light trapping becomes necessary to be effectively implemented with a textured surface. Surface texturing helps in the light trapping, and thereby raises short circuit current density and its efficiency. Such a scheme can be adapted to single junction as well as tandem solar cell, amorphous or micro-crystalline devices. A tandem cell is expected to have superior performance in comparison to a single junction cell and random surface textures appears to be preferable to a periodic structures.
박형식(Hyeongsik Park),신명훈(Myunghoon Shin),안시현(Shihyun Ahn),김선보(Sunbo Kim),봉성재(Sungjae Bong),Anh Le Tuan,S. Q. Hussain,이준신(Junsin Yi) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
Light trapping techniques can change the propagation direction of incident light and keep the light longer in the absorption layers of solar cells to enhance the power conversion efficiency. In thin film silicon (Si) solar cells, the thickness of absorption layer is generally not enough to absorb entire available photons because of short carrier life time, and light induced degradation effect, which can be compensated by the light trapping techniques. These techniques have been adopted as textured transparent conduction oxide (TCO) layers randomly or periodically textured, intermediate reflection layers of tandem and triple junction, and glass substrates etched by various patterning methods. We reviewed the light trapping techniques for thin film Si solar cells and mainly focused on the commercially available techniques applicable to textured TCO on patterned glass substrates. We described the characterization methods representing the light trapping effects, texturing of TCO and showed the results of multi-scale textured TCO on etched glass substrates. These methods can be used tandem and triple thin film Si solar cells to enhance photo-current and power conversion efficiency of long term stability.
Bong, Sungjae,Ahn, Shihyun,Anh, Le Huy Tuan,Kim, Sunbo,Park, Hyeongsik,Shin, Chonghoon,Park, Jinjoo,Lee, Younjung,Yi, Junsin American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>For thin film silicon-based solar cells, effective light trapping at a broad range of wavelengths (400-1100 nm) is necessary. Normally, etching is only carried out with TCOs, such as SnO2:F and impurity doped ZnO, to form nano-sized craters in the surface morphology to confer a light trapping effect. However, in this study, prior to ZnO: Al etching, periodic structures on the glass substrates were made by photolithography and wet etching to increase the light scattering and internal reflection. The use of periodic structures on the glass substrate resulted in higher haze ratios in the range from 550 nm to 1100 nm, which is the optical absorption wavelength region for thin film silicon solar cells, than obtained by simple ZnO: Al etching. The periodically textured glass with micro-sized structures compensates for the low haze ratio at the middle and long wavelengths of wet etched ZnO: Al. ZnO: Al was deposited on the periodically textured glass, after which the ZnO: Al surface was also etched randomly using a mixed acid solution to form nano-sized craters. The thin film silicon solar cells with 350-nm-thick amorphous silicon absorber layer deposited on the periodic structured glass and etched ZnO: Al generated up to 10.68% more photocurrent, with 11.2% increase of the conversion efficiency compared to the cell deposited on flat glass and etched ZnO: Al.</P>
장주연(Jang, Juyeon),박형식(Park, Hyeongsik),안시현(Ahn, Sihyun),조재현(Jo, Jaehyun),장경수(Jang, Kyungsoo),이준신(Yi, Junsin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Cost efficient and large area deposition of superior quality Al₂O₃ doped zinc oxide (AZO) films is instrumental in many of its applications including solar cell fabrication due to its numerous advantages over ITO films. In this study, AZO films were prepared by a highly efficient rotating cylindrical dc magnetron sputtering system using AZO target, which has a target material utilization above 80%, on glass substrates in argon ambient. A detailed analysis on the electrical, optical and structural characteristics of AZO thin films was carried out for solar cell application. The properties of films were found to critically depend on deposition parameters such as sputtering power, substrate temperature, working pressure, and thickness of the films. A low resistivity of {sim}5.5{times}10-4{Omega}-cm was obtained for films deposited at 2kW, keeping the pressure and substrate temperature constant at 3 mtorr and 230?C respectively, mainly due to an increase in carrier mobility and large grain size which would reduce the grain boundary scattering. The increase in carrier mobility with power can be attributed to the columnar growth of AZO film with (002) preferred orientation as revealed by XRD analysis. The AZO films showed a high transparency of>87% in the visible wavelength region irrespective of deposition conditions. Our results offers a cost-efficient AZO film deposition method which can fabricate films with significant low resistivity and high transmittance that can find application in thin-film solar cells.
Jung, Junhee,Ha, Kyungyeon,Cho, Jaehyun,Ahn, Shihyun,Park, Hyeongsik,Hussain, Shahzada Qamar,Choi, Mansoo,Yi, Junsin American Scientific Publishers 2013 Journal of nanoscience and nanotechnology Vol.13 No.12
<P>The preparation of thin film silicon solar cells containing Ag nanoparticles is reported in this article. Ag nanoparticles were deposited on fluorine doped tin oxide coated glass substrates by the evaporation and condensation method. a-Si:H solar cells were deposited on these substrates by cluster type plasma enhanced chemical vapor deposition. We discuss the double textured surface effect with respect to both the surface morphology of the substrate and the plasmonic effect of the Ag nanoparticles. Ag nanoparticles of various sizes from 10 to 100 nm were deposited. The haze values of the Ag embedded samples increased with increasing particle size whereas the optical transmittance decreased at the same conditions. The solar cell with the 30 nm size Ag nanoparticles showed a short circuit current density of 12.97 mA/cm2, which is 0.53 mA/cm2 higher than that of the reference solar cell without Ag nanoparticles, and the highest quantum efficiency for wavelengths from 550 to 800 nm. When 30 nm size nanoparticles were employed, the conversion efficiency of the solar cell was increased from 6.195% to 6.696%. This study reports the application of the scattering effect of Ag nanoparticles for the improvement of the conversion efficiency of amorphous silicon solar cells.</P>