Effect of Annealing and Semiconductor Nanoparticle Incorporation on the Performance of Hybrid Bulk Hetero-junction Solar Cells

트롱윈탐윈,박진호,정재학,Vu Luan Nguyen Truong,백성순 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.6

Hybrid bulk hetero-junction solar cells were fabricated by blending [6,6]-phenylen C<SUB>61</SUB>-butyric acid methyl ester (PCBM) and conjugate poly(3-hexyl thiophene) (P3HT) polymer. The effects of annealing and the incorporation of CdSe nanoparticles (NPs) on the device performance were investigated. Annealing and CdSe NPs incorporation increased the charge carrier separation at the PCBM/polymer interface by increasing the short circuit current and efficiency. Thermal annealing of the fabricated cell structure at 140 ℃ for 5 min was found to be optimal for the device performance, resulting in a maximum power conversion efficiency of 4.2 % under AM1.5G simulated solar irradiation.

Study of Composition, Heat Treatment, and Inorganic Nanocrystal Incorporation for Hybrid-solar-cells Performance

트롱윈탐윈,박진호,정재학,Vu Luan Nguyen Truong 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.7

Hybrid solar cells were fabricated by blending [6,6]-phenyl-C61-butyric acid methyl ester(PCBM) and conjugate polymers, such as poly(3-hexyl thiophene) (P3HT) and poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b’] -dithiophene)- alt -4,7-(2,1,3-benzothiadiazole)](PCPDTBT). The effects of solution composition, annealing, and the incorporation of inorganicsemiconductor nanocrystals (NCs) on the performance of the device were investigated. The compositesolution of a (PCBM:PCPDTBT) blend was optimized to control the surface morphologyof the active layer. The composite films constructed with (PCBM:PCPDTBT) ratios of 1:1, 2:1,and 3:1 were studied, and results showed that the surface of the active layers were quite smooth. Heat treatment on the fabricated cell structure was also studied and was optimized to improvethe device’s performance. To enhancement of the device’s efficiency, we added of semiconductingnanocrystals into the composite solution, which resulted in a maximum power conversion efficiencyof 4.56% under AM1.5G simulated solar irradiation.

Synthesis and thermal annealing treatment of octylphosphonic acid-capped CdSe-tetrapod nanocrystals for bulk hetero-junction solar cell applications

트롱윈탐윈,Kieu Thanh Trinh,Viet Thanh Hau Pham,김창득,박진호 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4

CdSe-tetrapod nanocrystals (NCs) were synthesized by using octylphosphonic acid (OPA) as a cappingligand and cadmium oxide (CdO) as a cadmium precursor. The effects of thermal annealing in nitrogen (N2) environmenton the chemical composition, morphology, crystal structure and optoelectronic properties of the CdSe-tetrapodshave been investigated. Remarkable difference in the morphological and optoelectronic properties between as-synthesizedand N2-annealed CdSe NCs was observed. The photoluminescence (PL) peak of N2-annealed CdSe NCs shiftedto lower energy and UV-vis absorption spectra shifted to longer wavelength, indicating the size increase and improvementof the crystallinity of the CdSe tetrapods. The power conversion efficiency of bulk hetero-junction solar cellsmade with the annealed CdSe NCs showed higher value compared with the efficiency of cells made with as-synthesizedCdSe NCs.

Effect of post-synthesis annealing on properties of SnS nanospheres and its solar cell performance

트롱윈탐윈,Ha Hai Thi Hoang,Thanh Kieu Trinh,Viet Thanh Hau Pham,Ryan Patrick Smith,박진호 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4

SnS nanospheres (NSPs) were synthesized, and the effects of thermal annealing on the structural, morphological, chemical compositional and optical properties were examined. As-synthesized SnS NPSs with a mean size of 3- 4 nm underwent a solid state morphological transformation by high temperature annealing in a nitrogen environment. Upon annealing, the size of SnS NSP increased to 5-6 nm with enhanced crystallinity. Also, the photoluminescence (PL) of the nitrogen-annealed samples slightly decreased in intensity with accompanying red-shift in spectrum. The power conversion efficiency of the solar cells using a polymer and the SnS NSPs was ~0.71%. These results confirm that the SnS NSPs demonstrate a potential as an inorganic material to be used in organic-inorganic hybrid bulk heterojunction (BHJ) photovoltaic devices.

Synthesis and characterization of CdSe nanocrystals in the presence of butylamine as a capping agent

박진호,트롱윈탐윈,김우경 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.4

TOPO-capped cadmium selenide (CdSe) nanocrystals of sizes between 3 and 8 nm have been synthesized,and the surface-capping molecule, trioctylphosphine oxide, was replaced by butylamine. The effects of changing the surface ligands of the synthesized CdSe nanocrystals on the structural, optical, and electrical properties were investigated. The shift toward shorter wavelength (higher energy) in the visible range of the optical absorption band edge was observed by UV-Vis spectroscopy, and a blue-shift of the photoluminescence peaks was observed with luminescent quenching. Surface modification was found to cause an increase in the surface energy of nanocrystals, resulting in the improvement in charge carrier separation and cell performance in applications towards bulk hetero-junction solar cells.

Ni 그래파이트 코어-쉘을 이용한 방열 접착제 제작 및 LED 조명으로의 적용

김창득,조연정,트롱윈탐윈 한국물리학회 2021 새물리 Vol.71 No.5

High-power light-emitting diode (LED) lighting exhibits excessive heat generation owing to the need to drive an LED chip, development of heat dissipation technology is required to resolve that problem. Until now, most of the studies on heat dissipation in LED lighting have been limited to research on heat dissipation of the chip itself and research into the manufacture of heat sinks. However, a solution in a new direction is required owing to the quantity of heat generated from dense LED chips found in high-power LED lighting or in situations where the space for the lighting is limited owing to its location. In this research, heat dissipation characteristics were improved by adding a Ni-graphite core-shell (Ni-GCS) to the thermally conductive adhesive used to bond the LED chip’s substrate to the heat sink in high-power LED lighting applications. Ni-GCS was synthesized through thermal chemical vaper deposition (thermal-CVD), and the Ni nanoparticles were confirmed are to be wrapped by a graphite layer. When high-power LED lighting using the novel thermally conductive adhesive was driven over a long period of time, improved heat dissipation characteristics were observed when the properties of the thermal changes were analyzed. 고출력 발광다이오드 (Light-emitting Diode, LED) 조명은 LED 칩 구동에 따른 발열의 문제를 가지며, 이 발열을 해결하기 위해 방열 기술의 개발이 필요하다. 그동안 LED 조명에서의 방열 연구는 대부분 칩자체의 방열 연구와 방열판의 제작 연구에 그쳤다. 하지만 고출력 LED 조명과 같은 밀집된 LED 칩에서 발생하는 높은 열이나 활용 장소에 따른 제한된 조명의 크기 문제가 있으므로 새로운 방향의 해결책이필요하다. 본 연구에서는 고출력 LED 조명에서 LED칩 기판과 방열판을 접합하는데 사용되는 방열접착제에 Ni 그래파이트 코어-쉘(Ni graphite core-shell, Ni-GCS)을 첨가해서 방열 특성을 개선하였다. Ni-GCS는 열화학기상증착법 (thermal chemical vaper deposition, thermal-CVD) 을 이용하여 합성하였고, 나노 크기의 Ni 입자가 그래파이트 층으로 둘러싸인 형태임을 확인하였다. 제작된 방열 접착제를 사용한 고출력 LED 조명을 장시간 구동하면서 열 변화 특성을 분석하여 향상된 방열 특성을 관찰하였다.

Ni-그래파이트 코어쉘 나노입자의 합성량 확대 연구

김창득,이형락,조연정,트롱윈탐윈 한국물리학회 2022 새물리 Vol.72 No.1

Various carbon-material applications require different carbon-material structures and characteristics. Thus, mass synthesis technology must be secured for these applications. In previous studies, Ni–graphite core–shell nanoparticles (CSNPs) comprising Ni nanoparticles wrapped in several graphene layers were synthesized via the thermal reduction of NiO nanoparticles using H2 in a horizontal thermochemical vapor-deposition (TCVD) system. This synthesis was limited by the low production of Ni–graphite CSNPs, i.e., few grams per hour. Therefore, a scale-up of the synthesis is required. The mass synthesis of Ni–graphite CSNPs was performed using vertical TCVD. The Ni–graphite CSNP synthesis using NiO nanoparticles was controlled via gas pressure and gravity. In this study, we conducted an investigation to scale up the synthesis of Ni–graphite CSNPs. The previous production of Ni–graphite CSNPs at a rate of a few grams per hour was improved to >100 g per hour. The Ni–graphite CSNPs synthesized in this study maintained their structural and physical properties.