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무기 나노입자가 첨가된 고체 고분자 전해질을 이용한 염료감응 태양전지의 특성분석

Title
무기 나노입자가 첨가된 고체 고분자 전해질을 이용한 염료감응 태양전지의 특성분석
Other Titles
Effects of Metal Oxide Nanoparticles on PEO-Based Composite Polymer Electrolyte in Solid State Dye-Sensitized Solar Cells
Author
손태욱
Alternative Author(s)
Son, Taewook
Advisor(s)
강용수
Issue Date
2011-02
Publisher
한양대학교
Degree
Master
Abstract
고체 고분자 전해질을 사용하는 염료감응 태양전지의 낮은 광 변환효율을 증가시키기 위해 다양한 종류의 금속 산화물 나노입자를 고분자 전해질에 도입하였다. 나노입자는 산화알루미늄, 이산화티타늄, 산화아연을 각각 전해질 질량의 10%로 첨가하였으며, 이에 따른 염료감응 태양전지의 성능변화와 특성분석에 대한 실험을 진행했다. 나노입자를 첨가하지 않은 기준 전해질에 비해 산화알루미늄을 첨가한 전해질의 경우 광전압의 상승과 광변환 효율의 상승(3.7 % → 3.9 %)을 확인 할 수 있었다. 이산화티타늄의 경우는 광전류는 대폭 상승(7.7 mA/cm2 → 9.5 mA/cm2) 하였으나 광전압이 많이 하락(0.71 V → 0.62 V) 하는 모습을 보였으며, 반대로 산화아연의 경우 광전압의 대폭 상승(0.71 V → 0.80 V)과 광전류의 하락(7.7 mA/cm2 → 4.8 mA/cm2)을 관찰했다. 첨가한 나노입자는 전해질 내에서 전해질의 성질을 변화 시키기도 하지만 광전극 및 상대전극과의 계면특성에 영향을 미치는데, 이런 계면 특성은 전기화학적 임피던스 분광법(Electrochemical Impedance Spectroscopy)으로 측정하였다. 또한 전해질에 첨가한 나노입자로 인해 광전극의 에너지준위 이동을 일으키는 현상을 전하 추출 방법(Charge Extraction Method)을 이용하여 관찰 할 수 있었고, 이는 염료감응 태양전지의 광전압을 변화시키는 중요한 요인이 된다. 에너지준위는 산화아연을 첨가한 전해질, 산화알루미늄을 첨가한 전해질, 기준 전해질, 이산화티타늄을 첨가한 전해질 순으로 나타났으며 (nEF, ZnO > nEF, Al2O3 > nEF, Ref. > nEF, TiO2)이는 각각의 전해질을 사용한 태양전지의 광전압 변화 경향과 일치함(Voc ZnO > Voc, Al2O3 > Voc, Ref. > Voc, TiO2)을 보였다. 추가적으로 나노입자 첨가에 따른 광전극의 전자 재결합 현상은 변화가 없음을 광량 조절 광전압 분광법(Intensity Modulated Photovoltage Spectroscopy)을 통해 확인 하였다. | Dye-sensitized solar cells (DSSCs) employing solid state polymer electrolytes have been researched in many groups because of their advantages such as no solvent leakage and evaporation. However, DSSCs with polymer electrolyte have exhibited lower energy conversion efficiency compared to liquid state DSSCs mostly due to lower ionic conductivity and the poorer interfacial contact. In this study, metal oxide nanoparticles (TiO2, Al2O3 and ZnO) were adopted to improve the performance of polymer-oligomer blend electrolyte system, and reaserched about effects of metal oxide nanoparticles. Photovoltaic performances of DSSCs were changed differently according to the type of metal oxide nanoparticles. Charge extraction method was used for study quasi-Fermi level of TiO2 layer. The quasi-Fermi level of device with composite polymer electrolyte was shifted in the order of ZnO > Al2O3 > reference > TiO2 where the refernce is the device without nanoparticles. The open-circuit potential of DSSCs followed the trend of energy level, and the short-circuit current was also changed with change of quasi-Fermi level of TiO2. A Change of quasi-Fermi level was mostly attributed to a change of concentration of free ion by changing the dielectric constant of nanoparticles.
Dye-sensitized solar cells (DSSCs) employing solid state polymer electrolytes have been researched in many groups because of their advantages such as no solvent leakage and evaporation. However, DSSCs with polymer electrolyte have exhibited lower energy conversion efficiency compared to liquid state DSSCs mostly due to lower ionic conductivity and the poorer interfacial contact. In this study, metal oxide nanoparticles (TiO2, Al2O3 and ZnO) were adopted to improve the performance of polymer-oligomer blend electrolyte system, and reaserched about effects of metal oxide nanoparticles. Photovoltaic performances of DSSCs were changed differently according to the type of metal oxide nanoparticles. Charge extraction method was used for study quasi-Fermi level of TiO2 layer. The quasi-Fermi level of device with composite polymer electrolyte was shifted in the order of ZnO > Al2O3 > reference > TiO2 where the refernce is the device without nanoparticles. The open-circuit potential of DSSCs followed the trend of energy level, and the short-circuit current was also changed with change of quasi-Fermi level of TiO2. A Change of quasi-Fermi level was mostly attributed to a change of concentration of free ion by changing the dielectric constant of nanoparticles.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/139812http://hanyang.dcollection.net/common/orgView/200000416294
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > CHEMICAL ENGINEERING(화학공학과) > Theses (Master)
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