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Optimal design of thin film photoelectrochemical cell and thermoelectric hybrid systems

Title
Optimal design of thin film photoelectrochemical cell and thermoelectric hybrid systems
Author
서효령
Advisor(s)
Jungho-Lee
Issue Date
2014-08
Publisher
한양대학교
Degree
Master
Abstract
A hybrid system in an integrated design is successfully fabricated, which consists of a silicon thin film photoelectrochemical cell (PEC) and a thermoelectric device (TE). The overpotential of c-Si substrates required for H2 evolution increases with the c-Si thickness decreasing because of a high surface recombination happened due to the surface minority carrier lifetime decreasing with decreasing the c-Si thickness. In the hybrid system, a PEC device as a photon-active element and a TE device as a phonon-active element separately generate a photovoltage and a thermovoltage, respectively. The thermovoltage acts as some compensation to the external voltage, consequently, reduces the overpotential. Owing to fully exploiting the solar spectrum, the system produces a sufficient voltage to drive the water splitting. The thin film with different thickness (from 100μm to 20μm) contrast tests are conducted. For 100μm thin film PEC-TE system, the ratio of the shifted voltage amount to the temperature gradient is comparable to the TE device Seeback coefficient, however, with decreasing the c-Si thickness, it is increased firstly and then decreased, and shows the maximum value in the 30μm thin film PEC-TE system, about 56% improvement compared to the 100μm thin film PEC-TE system.
URI
http://dcollection.hanyang.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000078212https://repository.hanyang.ac.kr/handle/20.500.11754/130330
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > FUSION CHEMICAL ENGINEERING(융합화학공학과) > Theses (Master)
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