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기계화학적 방법에 의한 CuSbS<sub>2</sub>와 CuSbSe<sub>2</sub> 나노입자의 합성
박보인,이승용,이도권,Park, Bo-In,Lee, Seung Yong,Lee, Doh-Kwon 한국태양광발전학회 2017 Current Photovoltaic Research Vol.5 No.4
$CuSbS_2$ (CAS) and $CuSbSe_2$ (CASe) nanocrystals (NCs), which consist of earth-abundant elements, were synthesized by a mechanochemical method. Elemental precursors such as copper, antimony, sulfur, and selenium were used without adding any organic solvents or additives. The NCs were synthesized by milling for a few hours. The sudden phase changes occurred by self-ignition and propagation, as previously observed in other mechanochemical synthetic processes. The XRD, Raman, and TEM analysis were carried out to determine the crystallinity and secondary phase of the as-synthesized CAS and CASe NCs, confirming the phase-pure synthesis of CAS and CASe. Optical properties were investigated by UV-Vis spectroscopy and it was observed that the band gap energies were about 1.1 and 1.5 eV, respectively for CAS and CASe, suggesting the potential for the use as solar cell materials. The NC colloids dispersed in anhydrous ethanol were prepared and coated on Mo substrates by a facile doctor-blade method. The investigation on the solar cell properties of the as-synthesized materials is underway.
기계화학적 방법으로 합성한 Cu<sub>2</sub>Zn(Sn,Ge)S<sub>4</sub> 나노결정과 이를 이용하여 제조한 태양전지
박보인,이승용,이도권,Park, Bo-In,Lee, Seung Yong,Lee, Doh-Kwon 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.3
$Cu_{1.8}Zn_{1.2}(Sn_{1-x}Ge_x)S_4$ (CZTGeS) nanocrystals were mechanochemically synthesized from elemental precursor powders without using any organic solvents and any additives. The composition of CZTGeS nanocrystals were systematically varied with different Ge mole fraction (x) from 0.1 to 0.9. The XRD, Raman spectroscopy, high-resolution TEM, and diffuse reflectance studies show that the as-synthesized CZTGeS nanocrystals exhibited consistent changes in various structural and optical properties as a function of x, such as lattice parameters, wave numbers for $A_1$ Raman vibration mode, interplanar distances (d-spacing), and optical bandgap energies. The bandgap energy of the synthesized CZTGeS nanocrystals gradually increases from 1.40 to 1.61 eV with increasing x from 0.1 to 0.9, demonstrating that Ge-doping is useful means to tune the bandgap of mechanochemically synthesized nanocrystals-based kesterite thin-film solar cells. The preliminary solar cell performance is presented with an efficiency of 3.66%.
고효율 페로브스카이트 태양전지용 무기 금속 산화물 기반 정공수송층의 개발
이하람(Haram Lee),킴 마이(Cuc Thi Kim Mai),장윤희(Yoon Hee Jang),이도권(Doh-Kwon Lee) 한국태양광발전학회 2020 Current Photovoltaic Research Vol.8 No.2
In perovskite solar cells with planar heterojunction configuration, selection of proper charge-transporting layers is very important to achieve stable and efficient device. Here, we developed solution processible Cu doped NiOx (Cu:NiOx) thin film as a hole-transporting layer (HTL) in p-i-n structured methylammonium lead trihalide (MAPbI₃) perovskite solar cell. The transmittance and thickness of NiOx HTL is optimized by control the spin-coating rate and Cu is additionally doped to improve the surface morphology of undoped NiOx thin film and hole-extraction properties. Consequently, a perovskite solar cell containing Cu:NiOx HTL with optimal doping ratio of Cu exhibits a power conversion efficiency of 14.6%.
비진공법 CuInSe<SUB>2</SUB> 태양전지에서 MoSe<SUB>2</SUB>의 생성을 억제하기 위한 산화몰리브데늄 확산장벽 층
이병석(Byung-Seok Lee),이도권(Doh-Kwon Lee) 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.3
Two-step processes for preparing Cu(In,Ga)Se2 absorber layers consist of precursor layer formation and subsequent annealing in a Se-containing atmosphere. Among the various deposition methods for precursor layer, the nonvacuum (wet) processes have been spotlighted as alternatives to vacuum-based methods due to their potential to realize low-cost, scalable PV devices. However, due to its porous nature, the precursor layer deposited on Mo substrate by nonvacuum methods often suffers from thick MoSe2 formation during selenization under a high Se vapor pressure. On the contrary, selenization under a low Se pressure to avoid MoSe2 formation typically leads to low crystal quality of absorber films. Although TiN has been reported as a diffusion barrier against Se1), the additional sputtering to deposit TiN layer may induce the complexity of fabrication process and nullify the advantages of nonvacuum deposition of absorber film. In this work, Mo oxide layers via thermal oxidation of Mo substrate have been explored as an alternative diffusion barrier. The morphology and phase evolution was examined as a function of oxidation temperature. The resulting Mo/Mo oxides double layers were employed as a back contact electrode for CuInSe2 solar cells and were found to effectively suppress the formation of MoSe2 layer.
기계화학적 방법으로 합성한 Cu₂Zn(Sn,Ge)S₄ 나노결정과 이를 이용하여 제조한 태양전지
박보인(Bo-In Park),이승용(Seung Yong Lee),이도권(Doh-Kwon Lee) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.3
Cu1.8Zn1.2(Sn1-xGex)S₄ (CZTGeS) nanocrystals were mechanochemically synthesized from elemental precursor powders without using any organic solvents and any additives. The composition of CZTGeS nanocrystals were systematically varied with different Ge mole fraction (x) from 0.1 to 0.9. The XRD, Raman spectroscopy, high-resolution TEM, and diffuse reflectance studies show that the as-synthesized CZTGeS nanocrystals exhibited consistent changes in various structural and optical properties as a function of x, such as lattice parameters, wave numbers for A1 Raman vibration mode, interplanar distances (d-spacing), and optical bandgap energies. The bandgap energy of the synthesized CZTGeS nanocrystals gradually increases from 1.40 to 1.61 eV with increasing x from 0.1 to 0.9, demonstrating that Ge-doping is useful means to tune the bandgap of mechanochemically synthesized nanocrystals-based kesterite thin-film solar cells. The preliminary solar cell performance is presented with an efficiency of 3.66%.
셀레늄과 세라믹 혼합분말을 사용한 Cu<sub>0.9</sub>In<sub>0.7</sub>Ga<sub>0.3</sub>Se<sub>2</sub> 분말층의 소결거동 연구
송봉근,황윤정,박보인,이승용,이재승,박종구,이도권,조소혜,Song, Bong-Geun,Hwang, Yoonjung,Park, Bo-In,Lee, Seung Yong,Lee, Jae-Seung,Park, Jong-Ku,Lee, Doh-Kwon,Cho, So-Hye 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
$Cu(In,Ga)Se_2$ (CIGS) thin films have been used as a light absorbing layer in high-efficiency solar cells. In order to improve the quality of the CIGS thin film, often selenization step is applied. Especially when the thin film was formed by non-vacuum powder process, selenization can help to induce grain growth of powder and densification of the thin film. However, selenization is not trivial. It requires either the use of toxic gas, $H_2Se$, or expensive equipment which raises the overall manufacturing cost. Herein, we would like to deliver a new, simple method for selenization. In this method, instead of using a costly two-zone furnace, use of a regular tube furnace is required and selenium is supplied by a mixture of selenium and ceramic powder such as alumina. By adjusting the ratio of selenium vs. alumina powder, selenium vaporization can be carefully controlled. Under the optimized condition, steady supply of selenium vapor was possible which was evidently shown by large grain growth of CIGS within a thin powder layer.
기계화학적 방법에 의한 CuSbS₂와 CuSbSe₂ 나노입자의 합성
박보인(Bo-In Park),이승용(Seung Yong Lee),이도권(Doh-Kwon Lee) 한국태양광발전학회 2017 Current Photovoltaic Research Vol.5 No.4
CuSbS₂ (CAS) and CuSbSe₂ (CASe) nanocrystals (NCs), which consist of earth-abundant elements, were synthesized by a mechanochemical method. Elemental precursors such as copper, antimony, sulfur, and selenium were used without adding any organic solvents or additives. The NCs were synthesized by milling for a few hours. The sudden phase changes occurred by self-ignition and propagation, as previously observed in other mechanochemical synthetic processes. The XRD, Raman, and TEM analysis were carried out to determine the crystallinity and secondary phase of the as-synthesized CAS and CASe NCs, confirming the phase-pure synthesis of CAS and CASe. Optical properties were investigated by UV-Vis spectroscopy and it was observed that the band gap energies were about 1.1 and 1.5 eV, respectively for CAS and CASe, suggesting the potential for the use as solar cell materials. The NC colloids dispersed in anhydrous ethanol were prepared and coated on Mo substrates by a facile doctor-blade method. The investigation on the solar cell properties of the as-synthesized materials is underway.
비화학양론적 전구체 조성 조절을 통한 페로브스카이트 태양전지의 개방전압 향상
윤희선(Hee-Sun Yun),장윤희(Yoon Hee Jang),이도권(Doh-Kwon Lee) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.1
The interest in perovskite solar cells has been skyrocketed owing to their rapid progress in efficiency in recent years. Here, we report the effect of non-stoichiometry in the methylammonium lead trihalide (MAPbI₃) precursors used in a solution process with different MAI : PbI₂ ratios of 1 : 0.96, 1 : 1.10, 1 : 1.15, and 1:1.20. With an increase in the PbI₂ content, the PbI₂ secondary phase was found to form at grain boundary region of perovskite thin films, as evidenced by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In terms of device performance, open-circuit voltage in particular is significantly improved with increasing the molar ratio of PbI₂, which is possibly ascribed to the reduction in recombination sites at grain boundary of perovskite and hence the prolonged life time of light-generated carriers according to the reported. As a result, the PbI₂-excess devices exhibited a higher power conversion efficiency compared to the MAI-excess ones.
이중층 몰리브데늄을 후면전극으로 적용한 비진공법 CuInSe₂ 태양전지의 특성
황지섭(Ji Sub Hwang),윤희선(Hee-Sun Yun),장윤희(Yoon Hee Jang),이장미(Jang mi Lee),이도권(Doh-Kwon Lee) 한국태양광발전학회 2020 Current Photovoltaic Research Vol.8 No.2
Molybdenum (Mo) thin films are widely used as back contact in copper indium diselenide (CISe) solar cells. However, despite this, there are only few published studies on the properties of Mo and characteristics of CISe solar cells formed on such Mo substrates. In this studies, we investigated the properties of sputter deposited Mo bilayer, and fabricated non-vacuum CISe solar cells using bilayer Mo substrates. The changes in surface morphology and electrical resistivity were traced by varying the gas pressure during deposition of the bottom Mo layer. In porous surface structure, it was confirmed that the electrical resistivity of Mo bilayer was increased as the amount of oxygen bonded to the Mo atoms increased. The resulting solar cell characteristics vary as the bottom Mo layer deposition pressure, and the maximum solar cell efficiency was achieved when the bottom layer was deposited at 7 mTorr with a thickness of 100 nm and the top layer deposited at 3 mTorr with a thickness of 400 nm.
셀레늄과 세라믹 혼합분말을 사용한 Cu<SUB>0.9</SUB>In<SUB>0.7</SUB>Ga<SUB>0.3</SUB>Se₂ 분말층의 소결거동 연구
송봉근(Bong-Geun Song),황윤정(Yoonjung Hwang),박보인(Bo-In Park),이승용(Seung Yong Lee),이재승(Jae-Seung Lee),박종구(Jong-Ku Park),이도권(Doh-Kwon Lee),조소혜(So-Hye Cho) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
Cu(In,Ga)Se₂ (CIGS) thin films have been used as a light absorbing layer in high-efficiency solar cells. In order to improve the quality of the CIGS thin film, often selenization step is applied. Especially when the thin film was formed by non-vacuum powder process, selenization can help to induce grain growth of powder and densification of the thin film. However, selenization is not trivial. It requires either the use of toxic gas, H₂Se, or expensive equipment which raises the overall manufacturing cost. Herein, we would like to deliver a new, simple method for selenization. In this method, instead of using a costly two-zone furnace, use of a regular tube furnace is required and selenium is supplied by a mixture of selenium and ceramic powder such as alumina. By adjusting the ratio of selenium vs. alumina powder, selenium vaporization can be carefully controlled. Under the optimized condition, steady supply of selenium vapor was possible which was evidently shown by large grain growth of CIGS within a thin powder layer.