Efficiency improvement of perovskite solar cells by applying uniform TiO2 blocking layer deposited by RF magnetron sputtering
- 주제(키워드) organic inorganic perovskite solar cell , compact TiO2 , RF magnetron sputtering , solar cell , interface , recombination
- 발행기관 고려대학교 대학원
- 지도교수 김동환
- 발행년도 2017
- 학위수여년월 2017. 8
- 학위구분 석사
- 학과 대학원 신소재공학과
- 세부전공 신소재공학 전공
- 원문페이지 76 p
- 실제URI http://www.dcollection.net/handler/korea/000000076999
- 본문언어 영어
- 제출원본 000045915323
초록/요약
Perovskite solar cells power conversion efficiency have remarkably increased from 3.81% to 21.0% in 7 years. Perovskite solar cell based on perovskite crystal structure had made by organic-inorganic hybrid materials. Structurer of perovskite solar cell was formed compact TiO2, mesoporous-TiO2, perovskite light absorber, hole conductor, two electrodes. Perovskite solar cells have higher dielectric constants than other thin film solar cells. The compact TiO2 transfers electrons generated from the perovskite layer to back electrode and blocks hole path moving to the wrong path. The quality of the thin film of the compact TiO2 is an important factor for the perovskite solar cells quality. Compact TiO2 prevents carrier recombination at the interface of fluorine-doped tin oxide (FTO) and perovskite layer. Compact TiO2 quality was influenced by deposition methods. We manufactured compact TiO2 different methods by spin-coating method, Radio Frequency (RF) magnetron sputtering method. Compact TiO2 must be formed as a thin dense film corresponding to the nearest n-type semiconductor or an insulator. We have investigated the problems of the conventional spin-coating method and fabricated thin, conformal, dense films with little cell-to-cell variability using the RF magnetron sputtering method. In addition, the RF magnetron sputtering method produces a higher crystal factor and fermi level than the spin-coated method and has an excellent fill factor (FF). When manufacturing large-sized perovskite solar cells, pinhole-free compact TiO2 can be produced without considering the area. Compact TiO2 made by RF magnetron sputtering is better power conversion efficiency than spin-coating method.
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Contents
Chapter 1. Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - 1
Chapter 2. Theoretical Background - - - - - - - - - - - - - - -- - - 3
2.1 Solar Cells - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3
2.1.1 Operating principle of solar cells - - - - - - - - - - - - 3
2.1.2 Current-Voltage characteristics - - - - - - - - - - - - - 7
2.1.3 Solar cells parameters - - - - - - - - - - - - - - - - - - - 10
2.1.4 Loss mechanism of solar cells - - - - - - - - - - - - - - 12
2.2 Perovskite solar cells - - - - - - - - - - - - - - - - - - - - - - - - 14
Chapter 3. Effect of TiO2 films deposited by different methods in organic-inorganic perovskite solar cells - - - - - - - - - - - - - - 19
3.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
3.2 Experimental procedure - - - - - - - - - - - - - - - - - - - - - - 20
3.3 Results and discussion - - - - - - - - - - - - - - - - - - - - - - - 22
3.4 Conclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30
Chapter 4. Influence of perovskite solar cell device performance by compact TiO2 of different methods - - - - - - - - - - - - - - -
34
4.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 34
4.2 Experimental procedure - - - - - - - - - - - - - - - - - - - - - - 35
4.3 Results and discussion - - - - - - - - - - - - - - - - - - - - - - - 39
4.4 Conclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55
References - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56
