https://scholar.dgist.ac.kr/handle/20.500.11750/16373 2026-04-04T16:56:55Z https://scholar.dgist.ac.kr/handle/20.500.11750/58438 Title: 시드 증착 공정을 이용한 안티몬 칼코할라이드 박막 제조방법, 이로부터 제조된 안티몬 칼코할라이드 박막 및 이를 포함하는 태양전지 Author(s): 최용찬 Abstract: 본 발명은 시드 증착 공정을 이용한 안티몬 칼코할라이드 박막 제조방법, 이로부터 제조된 안티몬 칼코할라이드 박막 및 이를 포함하는 태양전지에 관한 것으로, 구체적으로 본 발명은 기판을 준비하는 단계; 상기 기판 상에 제1 전구체 용액을 이용하여 시드를 제1 증착하는 단계; 및 상기 시드 상에 제2 전구체 용액을 이용하여 제2 증착하는 단계를 포함한다. 본 발명은 상기 방법으로 제조된 배향성이 조절된 안티몬 칼코할라이드 박막 및 상기 박막을 포함하는 태양전지에 관한 것이다. https://scholar.dgist.ac.kr/handle/20.500.11750/57917 Title: Blue photoluminescence from active carboxyl adatoms on nanoporous anodic alumina films Author(s): Cho, Sam Yeon; Yeo, Kangmo; Kim, Jin Woo; Kwak, Jin Ho; Cho, Deok-Yong; Jang, Jae Hyuck; Jeong, Sukmin; Choi, Yong Chan; Bu, Sang Don Abstract: Nanoporous anodic alumina (nPAA) films formed on aluminum in lower aliphatic carboxylic acids exhibit blue self-coloring and characteristic properties such as photoluminescence (PL), electroluminescence, and electron spin resonance. The blue colors are seemingly originated from the adsorbed radicals incorporating into the oxide during the aluminum anodization. However, there is lack of reports revealing the detailed activation mechanism of the adatoms in the complexes. This study investigates the blue PL and its correlation with the atomic and electronic structures of the active aluminum surface using multiple theoretical and experimental methods. The results show that the concentration of carboxylates at the nPAA surface is highly correlated with the blue colorization and manifest that unpaired electrons in carbon (derived from the carboxylates) bridging two aluminum atoms at surface can play as an active source of the blue colorization. Therefore, it is suggested that controlling the adsorption of the carboxylate on the alumina membrane having large surface-to-volume ratio can be an efficient way to generate the blue light for the optoelectronic applications. © 2025. The Author(s). 2024-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47498 Title: Influence of atmospheric conditions on the formation and structural properties of two-dimensional SbSI films Author(s): Choi, Yong Chan; Chung, Yeonseo; Han, Ji Yoon; Hyung, Ji Eun; Kim, Hae-Soo Abstract: Two-dimensional heavy pnictogen chalcohalides, such as SbSI, SbSeI, and BiSI, are promising materials for solar energy harvesting (SEH) devices. In this paper, we report the influence of atmospheric conditions on the formation and structural properties of SbSI films fabricated under N2 and air atmospheres using a modified two-step method. Under N2 atmosphere, a preferentially (1 2 1)-oriented SbSI film without impurities formed. In contrast, under air atmosphere, a film with mixed crystalline phases of SbSI and secondary Sb2O3 formed. The Sb2O3 phase could be reduced by applying excess sulfur. These results provide a fundamental step toward optimizing the properties of chalcohalides for SEH device applications. © 2023 Elsevier B.V. 2024-01-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47113 Title: Recent Developments on Inorganic-Organic Hybrid Solar Cells Sensitized with Solution-Processed Sb-Based Chalcogenides Author(s): Choi, Yong Chan Abstract: Sb-based chalcogenides (Sb-Chs), such as Sb2S3, Sb2Se3, and Sb2(S,Se)3, are of particular interest as light absorbers for solar cells because of their excellent optical properties including easily tunable band-gaps by adjustable composition, high molar extinction coefficients, and large intrinsic dipole moments. Recently, the high efficiency of ~ 7.5 % in the Sb2S3-sensitized devices was achieved via a thioacetamide-assisted post-surface-treatment. In addition, different methods have been suggested for improving device performance as well as reproducibility. However, the photovoltaic performances is still restricted by strong charge recombination (low open circuit voltage VOC) and insufficient light-harvesting (low short circuit current density JSC). In this talk, I will introduce recent developments in several types of solar cells based on Sb-Chs, i.e. Sb2S3, Sb2Se3, and graded Sb2(S,Se)3. The materials are fabricated by different solutions methods, such as chemical bath deposition, single source precursor method, complex solution method, and combined method. The material properties and their device performances are highly dependent on the methods used. Here I will show the correlation of fabrication methods and materials with photovoltaic performances. This talk may give some clues for further efficiency improvements and enlightens us to find proper methods and potential absorbers. 2017-10-24T15:00:00Z