https://scholar.dgist.ac.kr/handle/20.500.11750/16375 2026-04-04T10:34:59Z 2026-04-04T10:34:59Z Choi, Yong Chan https://scholar.dgist.ac.kr/handle/20.500.11750/47113 2025-07-25T03:21:46Z 2017-10-24T15:00:00Z

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 Sanchez, Omar Ramirez Park, Jeong-Hyun Choi, Yong Chan Lee, Jong-Soo https://scholar.dgist.ac.kr/handle/20.500.11750/47033 2025-07-25T02:39:24Z 2017-11-21T15:00:00Z

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 Lee, Yang Soo Lee, Jong-Soo Choi, Yong Chan https://scholar.dgist.ac.kr/handle/20.500.11750/47030 2025-07-25T03:35:55Z 2017-11-21T15:00:00Z

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 Choi, Yong Chan Kim, Dae-Hwan https://scholar.dgist.ac.kr/handle/20.500.11750/47017 2025-07-25T04:08:01Z 2017-11-30T15:00:00Z

Title: Developments on Hybrid Solar Cells Based on Solution-Processed Sb-based Light Absorbers Author(s): Choi, Yong Chan; Kim, Dae-Hwan Abstract: Sb-related chalcogenides, 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 [1]. In addition, different methods have been suggested for improving device performance as well as reproducibility [1–5]. 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. I will show the correlation of fabrication methods and materials with photovoltaic performances. Finally, I will briefly introduce new light absorbers of Sb chalcohalides and their application to solar cells [6]. This talk may give some clues for further efficiency improvements and enlightens us to find proper methods and potential absorbers.

2017-11-30T15:00:00Z