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Jeong, Ho-Jung,Kim, Ye-Chan,Lee, Soo Kyung,Jeong, Yonkil,Song, Jin-Won,Yun, Ju-Hyung,Jang, Jae-Hyung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.30
<P>Conventional Cu(In1-x,Ga-x)Se-2 (CIGS) solar cells exhibit poor spectral response due to parasitic light absorption in the window and buffer layers at the short wavelength range between 300 and 520 nm. In this study, the CdSe/CdZnS core/shell quantum dots (QDs) acting as a luminescent down-shifting (LDS) layer were inserted between the MgF2 antireflection coating and the window layer of the GIGS solar cell to improve light harvesting in the short wavelength range. The LDS layer absorbs photons in the short wavelength range and re-emits photons in the 609 nm range, which are transmitted through the window and buffer layer and absorbed in the CIGS layer. The average external quantum efficiency in the parasitic light absorption region (300-520 nm) was enhanced by 51%. The resulting short circuit current density of 34.04 mA/cm(2) and power conversion efficiency of 14.29% of the CIGS solar cell with the CdSe/CdZnS QDs were improved by 4.35 and 3.85%, respectively, compared with those of the conventional solar cells without QDs.</P>
Jeong, Yonkil,Kim, Chae-Woong,Park, Dong-Won,Jung, Seung Chul,Lee, Jongjin,Shim, Hee-Sang Springer 2011 NANOSCALE RESEARCH LETTERS Vol.6 No.1
<P>The influence of Na on Cu(In,Ga)Se<SUB>2 </SUB>(CIGS) solar cells was investigated. A gradient profile of the Na in the CIGS absorber layer can induce an electric field modulation and significantly strengthen the back surface field effect. This field modulation originates from a grain growth model introduced by a combination of alloy-hardening and pair-annihilation probabilities, wherein the Cu supply and Na diffusion together screen the driving force of the grain boundary motion (GBM) by alloy hardening, which indicates a specific GBM pinning by Cu and Na. The pair annihilation between the ubiquitously evolving GBMs has a coincident probability with the alloy-hardening event.</P><P><B>PACS: </B>88. 40. H-, 81. 10. Aj, 81. 40. Cd,</P>
3-5족 적층형과 CuInGa(S,Se)2 및 Cu2ZnSn(S,Se)4 화합물반도체 박막태양전지
정연길 ( Yonkil Jeong ),박동원 ( Dong Won Park ),이재광 ( Jae Kwang Lee ),이재영 ( Jaeyoung Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.5
신 기후변화대응(Post 2020)을 위한 대체에너지의 역할과 더불어 태양전지의 중요성이 높아져 가고 있다. 태양전지의 종류는 크게 재료관점에서 보면 유기물과 무기물 계열로 구분할 수 있지만 대규모 발전역할에서는 현재까지 실리콘과 같이 양산성과 안정성 기반의 무기물 태양전지가 주된 역할을 하고 있다. 특히 최근 몇 년간 화합물반도체 태양전지에 대한 연구는 급속도로 가속화되면서 3-5족 적층형 태양전지, chalcopyrite 계열 CuInGa(S,Se)2 (CIGSSe) 태양전지와 kesterite 계열 Cu2ZnSn(S,Se)4 (CZTSSe) 태양전지 연구가 대표적으로 주류를 이루어 왔다. 따라서 화합물반도체 태양전지에서 주류를 이루고 있는 3-5족 적층형, CIGSSe 및 CZTSSe 태양전지들의 연구개발동향 및 기술적인 주요내용들에 대해 소개하고자 한다. Solar cells with other alternative energies are being importantly recognized related with post-2020 climate change regime formation. In a point of view of materials, solar cells are classified to organic and inorganic solar cells which can provide a plant-scale electricity. In particular, recent studies about compound semiconductor solar cells, such as III-V tandem solar cells, chalcopyrite-series CIGSSe solar cells, and kesterite-series CZTSSe solar cells were rapidly accelerated. In this report, we introduce a research trend and technical issues for the compound semiconductor solar cells.
Song, Young Min,Jeong, Yonkil,Yeo, Chan Il,Lee, Yong Tak Optical Society of America 2012 Optics express Vol.20 No.6
<P>We present the effect of broadband antireflective coverglasses (BARCs) with moth eye structures on the power generation capability of a sub-receiver module for concentrated photovoltaics. The period and height of the moth eye structures were designed by a rigorous coupled-wave analysis method in order to cover the full solar spectral ranges without transmission band shrinkage. The BARCs with moth eye structures were prepared by the dry etching of silver (Ag) nanomasks, and the fabricated moth eye structures on coverglass showed strongly enhanced transmittance compared to the bare glass with a flat surface, at wavelengths of 300 - 1800 nm. The BARCs were mounted on InGaP/GaAs/Ge triple-junction solar cells and the power conversion efficiency of this sub-receiver module reached 42.16% for 196 suns, which is a 7.41% boosted value compared to that of a module with bare coverglass, without any detrimental changes of the open circuit voltages (V<sub>oc</sub>) and fill factor (FF).</P>
Interfacial Charge-Transfer Loss in Dye-Sensitized Solar Cells
Park, Dong-Won,Jeong, Yonkil,Lee, Jongjin,Lee, Jaeyoung,Moon, Seung-Hyeon American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.6
<P>Interfacial charge-transfer loss factors (CTLFs) of dye-sensitized solar cells (DSCs) were studied using a thermionic emission–diffusion theory and electrochemical impedance spectroscopy (EIS). It is found that the subsidiary CTLFs can be quantified including a native charge-transfer loss at the TiO<SUB>2</SUB>/electrolyte interface in DSC devices. The obtained CTLFs as a probability parameter α were identified as almost matching to dominant resistance-capacitance (RC) time constants obtained from the EIS and its numerical calculation. The quantified CTLFs based on a detailed physical model of quantum-mechanical tunneling and reflection of charge carriers can explain a degradation of open-circuit voltage in DSC devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-6/jp308193y/production/images/medium/jp-2012-08193y_0008.gif'></P>
Park, Dong-Won,Jeong, Yonkil,PremKumar, Thangapandi,Lee, Jaeyoung American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16
<P>Effectiveness of TiCl3 pre- and post-treatments on dye-sensitized solar cells (DSCs) and interfacial charge-transfer properties were investigated. It was confirmed that a yield of current collection was strongly dependent on the position of the TiCl3/electrolyte matrix in the DSC configuration. The interfacial charge-transfer properties were studied using thermionic emission-diffusion process and electrochemical impedance spectroscopy analysis. The TiCl3/electrolyte matrix was considered to be a three-dimensional quasi-photonic crystal with a photonic band gap, which reinforces electric field and facilitates current collection from the TiCl3/electrolyte matrix to the FTO by accelerating electron motion, whereas the potential barrier blocks current collection from the TiO2 bulk region to the FTO and decreases current.</P>
InAs 양자점의 광학적 성질에 미치는 초격자층의 영향
정연길,최현광,박유미,황숙현,윤진주,이제원,임재영,전민현,Jeong Yonkil,Choi Hyonkwang,Park Yumi,Hwang Sukhyon,Yoon Jin-Joo,Lee Jewon,Leem Jae-Young,Jeon Minhyon 한국재료학회 2004 한국재료학회지 Vol.14 No.2
We investigated the effects of high potential barriers on the optical characteristics of InAs quantum dots (QDs) by using photoluminescence (PL) and photoreflectance (PR) spectroscopy. A sample with regular InAs quantum dots on GaAs was grown by molecular beam epitaxy (MBE) as a reference. Another InAs QDs sample was embedded in single AlGaAs barriers. On the other hand, a sample with GaAs/AlGaAs superlattice barriers was adopted for comparison with a sample with a single AlGaAs layer. In results, we found that the emission wavelength of QDs was effectively tailored by using high potential barriers. Also, it was found that the optical properties of a sample with QDs embedded in GaAs/AlGaAs superlattices were better than those of a sample with QDs embedded in a single layer of AlGaAs barriers. We believe that GaAs/AlGaAs superlattice could effectively prevent the generation of defects.