https://scholar.dgist.ac.kr/handle/20.500.11750/244 2026-04-04T13:10:09Z https://scholar.dgist.ac.kr/handle/20.500.11750/47081 Title: Improvement of Perovskite Solar Cells with Environment friendly CuSbS2 Hole Transport layer Author(s): 박정현; 문진욱; 박수환; 서승환; 조승현; 이종수 2017-11-08T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47033 Title: Synthesis of Copper Antimony Sulfide Nanocrystals based on Cu2S Nanoparticles Capped with Sb2S3 Ligand for Solar Cell Applications Author(s): Sanchez, Omar Ramirez; Park, Jeong-Hyun; Choi, Yong Chan; Lee, Jong-Soo Abstract: With the aim to replace the energy of fossil fuels with solar energy, researchers have focused their efforts on the development of next-generations solar cells [1]. The solar cells based on inorganic metal chalcogenides nanocrystals (NCs) are shaping up as promising candidates because of their unique optical/electrical properties and processability. Copper antimony sulfide (CAS) is I-V-VI type metal chalcogenides based on low-toxic and earth-abundant elements that can be synthesized in four main phases: CuSbS2 (chalcostibite), Cu12Sb4S13 (tetrahedrite), Cu3SbS3 (skinnerite), and Cu3SbS4 (fematinite). All four phased CAS exhibit p-type semiconducting behaviors with an optical band gap ranging from 0.5 to 2 eV and a high absorption coefficient between 104 and 105 cm-1. Despite of its attracting optical and electrical properties, CAS NCs have been rarely studied for solar cell applications achieving, up to now, a power conversion efficiency record of 0.01% [2]. One of the main drawbacks of NCs in solar cell applications is the utilization of large organic ligands required for stability. However, these organic ligands act as insulators that hinder NCs-based solar cells’ performance. In this work, we synthesized different phased CAS NCs using copper sulfide (Cu2S) NPs as precursor and the ligand exchange concept to remove the organic ligands and replace them with antimony sulfide (Sb3S2). By adjusting the ligand amount and molar concentration, we were able to control the stoichiometry leading to formation of different CAS phases. We fabricated photovoltaic devices composed of CAS NCs thin films by NCs thinning process on substrates. We will discuss the correlation between CAS properties and photovoltaic device performance. 2017-11-21T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47030 Title: Controlled Cu2SnS3 CTS Thin Film Growth by Centrifugal Colloidal Casting for CTS Solar Cell Applications Author(s): Lee, Yang Soo; Lee, Jong-Soo; Choi, Yong Chan Abstract: Thin film solar cell technology has attracted substation attention due to its potential to achieve inexpensive, environmentally friendly, and high performance. Especially, Cu2SnS3 (CTS) is considered recently as efficient solar absorbers in thin film solar cells because it composed of earth abundant and non-toxic elements. It also exhibits high absorption coefficient and desirable optical/electrical properties. In this work, we report the CTS thin films fabricated using CTS colloidal quantum dots (CQDs), where the CQDs were synthesized by hot injection method. The ligands and structures of CQDs were controlled for optimized thin film fabrications. The thin films were deposited on substrates by centrifugal casting and subsequent annealing. [1] Through this technique combined with CQDs solution tuning, we could control film thickness as well as resultant film properties. Our method may give some clues for achieving low-cost and high-efficient thin film solar cells. 2017-11-21T15:00:00Z