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Synthesis and Characterization of Type II core/shell Nanocrystals for Quantum-Dot-Sensitized Solar Cells

Title
Synthesis and Characterization of Type II core/shell Nanocrystals for Quantum-Dot-Sensitized Solar Cells
Translated Title
Type II 코어쉘 나노결정 양자점의 합성과 양자점 감응형 태양전지에 대한 연구
Authors
Kim, Soo Jin
DGIST Authors
Kim, Soo Jin; Lee, Jong Soo; Jeong, Nak Cheon
Advisor(s)
Lee, Jong Soo
Co-Advisor(s)
Jeong, Nak Cheon
Issue Date
2015
Available Date
2015-01-12
Degree Date
2015. 2
Type
Thesis
Keywords
Quantum dot sensitized solar celltype-II Core/Shell nanocrystals quantum dotsZnSe/CdS Type-II Core/ShellSb2S3NPsFeS2 NCs
Abstract
In these work, type-II ZnSe/CdS core/shell nanocrystals (quantum dots, QDs) are explored as sensitizers for Quantum-Dot-Sensitized Solar Cells. Type-II ZnSe/CdS QDs synthesized by hot injection method offered low-cost and mono-dispersed QDs. Type-II QDs were expected to have the special electron-hole pair separation character as sensitizers in QDSSCs that are fundamentally different from the type-I QDs. Among their advantages is the broad absorption range in the solar irradiation spectrum and efficient carrier extraction. The result shows that multicomponent type-II ZnSe/CdS Core/Shell QDSSCs reach to higher Jsc value (3.49 mAcm-2) than Jsc value (2.6 mAcm-2) of single component CdSe QDSSCs. For the counter electrode of QDSSCs, Cu2S nanocrystals were applied to improve the catalytic activity. I also reported characteristic of Sb2S3 which is promising sensitizer materials for QDSSCs. Colloidal amorphous Sb2S3 nanoparticles were synthesized and transition to crystal were obtained after annealing process. FeS2 are also potential materials for photovoltaic materials. FeS2 NCs were synthesized by hot injection method and nanoparticles were obtained with a diameter of ~2 nm and UV-Vis-NIR absorption of FeS2 NCs shows a wide absorption up to 1400nm. ⓒ 2015 DGIST
Table Of Contents
1. Introduction -- 2. Background -- 2.1 Solar Cells -- 2.2 Quantum Dots -- 2.2.2 Properties of quantum dots -- 2.2.3 Multicomponent Nanocrystals -- 2.3. Quantum Dots-Sensitized Solar Cells -- 2.3.1 Operation of the QDSSCs -- 2.3.2 The operation of QDSSCs -- 3.Experiment -- 3.1 Materials -- 3.2 Synthesis of NCs -- 3.2.1 Synthesis of CdSe QDs -- 3.2.2 Synthesis of ZnSe QDs -- 3.2.3 Overcoating with CdS -- 3.2.4 Synthesis of Cu2S QDs -- 3.2.5 Synthesis of Sb2S3 -- 3.2.6 Synthesis of FeS2 -- 3.3 Fabrication of photo electrode -- 3.4 Fabrication of counter electrode -- 3.5 Assembly of the QDSSCs -- 3.6 Material Characterization -- 4. Result and discussion -- 4.1 CdSe Quantum-Dot-Sensitized Solar Cells -- 4.1.1 Optical analysis-CdSe nanocrystals -- 4.1.2 Cu2S Nanocrystals -- 4.1.3 Photovoltaic measurement - CdSe QDSSCs -- 4.2 ZnSe/Cds Type II core/shell nanocrystals -- 4.2.1 Optical analysis - ZnSe NCs and ZnSe/CdSe NCs -- 4.2.2 Photovoltaic measurement - ZnSe/Cds Type II core nanocrystals QDSSCs -- 4.3 FeS2 Nanocrystals and Sb2S3 nanoparticles for promising materials for QDSSCs -- 4.3.1 FeS2 Nanocrystals -- 4.3.2 Sb2S3 Nanoparticles -- 5. Conclusions -- 6. Summary -- 7. References
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001922615
http://hdl.handle.net/20.500.11750/1377
DOI
10.22677/thesis.1922615
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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