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Park, Hyeongsik,Lee, Youn-Jung,Park, Jinjoo,Kim, Youngkuk,Yi, Junsin,Lee, Youngseok,Kim, Sangho,Park, Chang-Kyun,Lim, Kyung-Jin The Korean Institute of Electrical and Electronic 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
In this paper, we report a technical approach regarding an amorphous silicon (a-Si)/crystalline silicon (c-Si) heterojunction solar cell to solve the previous issues, and we investigate the applications of front and back transparent conductive oxides (TCOs) on this high-efficiency solar cell. The presentation of front and rear-emitter structure solar cells is included, and we investigate the TCO-material candidates for the Si heterojunction (SHJ) solar cell according to the electrical and optical properties. A high-quality TCO film is very important because it is linked to the efficiency of the c-Si-based silicon solar cell. The intention here is the applying of a high-efficiency SHJ solar cell by fabricating the high-quality TCO materials of the investigation of this study.
Hyeongsik Park,Doyoung Kim,Eun-Chel Cho,Shahzada Qamar Hussain,Jeongeun Park,Donggun Lim,Sangho Kim,Subhajit Dutta,Mallem Kumar,Youngkuk Kim,Junsin Yi 한국물리학회 2020 Current Applied Physics Vol.20 No.1
In this study, we investigated the effect of plasma treatment on an indium tin oxide (ITO) film under an ambient Ar atmosphere. The sheet resistance of the plasma-treated ITO film at 250W (37.6 Ω/sq) was higher than that of the as-deposited ITO film (34 Ω/sq). Plasma treatment was found to decrease the ITO grain size to 21.81 nm, in comparison with the as-deposited ITO (25.49 nm), which resulted in a decrease in the Hall mobility. The work function of the Ar-plasma-treated ITO (WFITO=4.17 eV) was lower than that of the as-deposited ITO film (WFITO=5.13 eV). This lower work function was attributed to vacancies that formed in the indium and oxygen vacancies in the bonding structure. Rear-emitter silicon heterojunction (SHJ) solar cells fabricated using the plasma-treated ITO film exhibited an open circuit voltage (VOC) of 734 mV, compared to SHJ cells fabricated using the as-deposited ITO film, which showed a VOC of 704 mV. The increase in VOC could be explained by the decrease in the work function, which is related to the reduction in the barrier height between the ITO and a-Si:H (n) of the rear-emitter SHJ solar cells. Furthermore, the performance of the plasma-treated ITO film was verified, with the front surface field layers, using an AFORS-HET simulation. The current density (JSC) and VOC increased to 39.44 mA/cm2 and 736.8 mV, respectively, while maintaining a WFITO of 3.8 eV. Meanwhile, the efficiency was 22.9% at VOC=721.5 mV and JSC=38.55 mA/cm2 for WFITO=4.4 eV. However, an overall enhancement of 23.75% in the cell efficiency was achieved owing to the low work function value of the ITO film. Ar plasma treatment can be used in transparent conducting oxide applications to improve cell efficiency by controlling the barrier height.
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>
Park, Hyeongsik,Shin, Myunghun,Kim, Hyeongseok,Kim, Sunbo,Le, Anh Huy Tuan,Kang, Junyoung,Kim, Yongjun,Pham, Duy Phong,Jung, Junhee,Yi, Junsin Elsevier 2017 Optical materials Vol.66 No.-
<P><B>Abstract</B></P> <P>A comparative study of 3-dimensional textured glass morphologies with variable haze value and chemical texturing of the glass substrates was conducted to enhance light trapping in silicon (Si) thin film solar cells (TFSCs). The light trapping characteristics of periodic honeycomb structures show enhanced transmittance and haze ratio in numerical and experimental approaches. The periodic honeycomb structure of notched textures is better than a random or periodic carved structure. It has high transmittance of ∼95%, and haze ratio of ∼52.8%, and the haze property of the angular distribution function of transmittance shows wide scattering angles in the long wavelength region because of the wide spacing and aspect ratio of the texture. The numerical and experimental approaches of the 3-D texture structures in this work will be useful in developing high-performance Si TFSCs with light trapping.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3-D Light trapping structures are investigated for Si thin film solar cells. </LI> <LI> A glass texturing method is developed using chemical solutions of diluted HF. </LI> <LI> FDTD simulation shows a notched periodic honeycomb texture will be effective one. </LI> <LI> Periodic texturing shows better light scattering performance than random structures. </LI> <LI> Fabricated periodic honeycomb structure shows high transmittance and haze values. </LI> </UL> </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.
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, Jinjoo,Shin, Chonghoon,Park, Hyeongsik,Jung, Junhee,Lee, Youn-Jung,Bong, Sungjae,Dao, Vinh Ai,Balaji, Nagarajan,Yi, Junsin American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.3
<P>We investigated thin film silicon solar cells with boron doped hydrogenated nanocrystalline silicon/ hydrogenated amorphous silicon oxide [p-type nc-Si:H/a-SiOx:H] layer. First, we researched the bandgap engineering of diborane (B2H6) doped wide bandgap hydrogenated nanocryslline silicon (p-type nc-Si:H) films, which have excellent electrical properties of high dark conductivity, and low activation energy. The films prepared with lower doping ratio and higher hydrogen dilution ratio had higher optical gap (Eg), with higher dark conductivity (??(d)), and lower activation energy (Ea). We controlled Eg from 2.10 eV to 1.75 eV, with ??(d) from 1.1 S/cm to 7.59 x 10(-3) S/cm, and Ea from 0.040 eV to 0.128 eV. Next, we focused on the fabrication of thin film silicon solar cells. By inserting p-type nc-Si:H film into the thin film silicon solar cells, we achieved a remarkable increase in the built-in potential from 0.803 eV to 0.901 eV. By forming p-type nc-Si:H film between SnO2:F/ZnO:Al (30 nm) and p-type a-SiOx:H layer, the solar cell properties of open circuit voltage (Voc), short circuit current density (Jsc), and efficiency (관) were improved by 3.7%, 9.2%, and 9.8%, respectively.</P>
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.
Hyeongsik Park,이윤정,박진주,김영국,이준신,이영석,김상호,박창균,임경진 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
In this paper, we report a technical approach regarding an amorphous silicon (a-Si)/crystalline silicon (c-Si) heterojunctionsolar cell to solve the previous issues, and we investigate the applications of front and back transparent conductive oxides(TCOs) on this high-effi ciency solar cell. The presentation of front and rear-emitter structure solar cells is included, andwe investigate the TCO-material candidates for the Si heterojunction (SHJ) solar cell according to the electrical and opticalproperties. A high-quality TCO fi lm is very important because it is linked to the effi ciency of the c-Si-based silicon solarcell. The intention here is the applying of a high-effi ciency SHJ solar cell by fabricating the high-quality TCO materials ofthe investigation of this study.