Study on the Efficient Hole Transporting Materials for Perovskite-Based Solar Cells
- 주제(키워드) solar cell
- 발행기관 고려대학교 대학원
- 지도교수 고재중
- 발행년도 2015
- 학위수여년월 2015. 8
- 학위구분 석사
- 학과 대학원 소재화학과
- 원문페이지 46 p
- 실제URI http://www.dcollection.net/handler/korea/000000059822
- 본문언어 영어
- 제출원본 000045841659
초록/요약
Perovskite solar cells based on organometal halide light absorbers have been considered a promising photovoltaic technology due to their superb power conversion efficiency (PCE) along with very low material costs. Since the first report on a long-term durable solid-state perovskite solar cell with a PCE of 9.7% in 2012, a PCE as high as 19.3% was demonstrated in 2014, and a certified PCE of 20.1% was shown in 2014. Such a high photovoltaic performance is attributed to optically high absorption characteristics and balanced charge transport properties with long diffusion lengths. Nevertheless, there are lots of puzzles to unravel the basis for such high photovoltaic performances. The working principle of perovskite solar cells has not been well established by far, which is the most important thing for understanding perovksite solar cells. In this review, basic fundamentals of perovskite materials including optoelectronic and dielectric properties are described to give a better understanding and insight into high-performing perovskite solar cells. In addition, various fabrication techniques and device structures are described toward the further improvement of perovskite solar cells. Here, the focus is two symmetrical star-shaped hole transporting materials (HTMs), i.e. FA-MeOPh and TPA-MeOPh with a fused triphenylamine or triphenylamine core and diphenylethenyl side arms were synthesized. FAMeOPh showed a strong molar absorption coefficient and a red shifted absorption compared with TPA-MeOPh because of its planar configuration. The power conversion efficiency (PCE) of the perovskite solar cells based on FA-MeOPh and TPA-MeOPh is about 11.86% and 10.79%, in which the efficiency of former is comparable to that (12.75%) of spiro-OMeTAD based cell. The high photocurrent (18.39 mA cm2) of FA-MeOPh based solar cell relative to TPA-MeOPh based one may be attributable to the enhanced absorption in the near-IR region for mp-TiO2/ CH3NH3PbI3/HTM based cell. The high mobility and low series resistance of mp-TiO2/ CH3NH3PbI3/FA-MeOPh based cell led to the high fill factor (0.698) of FA-MeOPh based solar cell relative to TPA-MeOPh based one (0.627). In addition, the FA-MeOPh based cell showed a relative stability under light soaking for 250 h. The high efficiency, relative stability, synthetically simple and inexpensive materials as the HTMs hold promise to replace the expensive spiro-OMeTAD.
more목차
Abstract - 1
Chapter 1. Introduction of Perovskite Solar Cells - 2
1.1 Historical Background of Organometal Halide Perovskites - 3
1.2 Working Principle and Device Structures - 4
1.3 Photoluminescence and Polarization Characteristics - 9
1.4 Reference - 13
Chapter 2. Organic Hole-Transporting Materials 16
2.1 Small Molecule Hole-Conductors 17
2.2 Conducting Polymers - 21
2.3 Organometallic Compounds - 26
2.4 Reference - 27
Chapter 3. Diphenylethenyl Side Arms for a Perovskite Solar Cell - 30
3.1 Introduction - 31
3.2 Result and discussion - 32
3.3 Experimental - 38
3.3.1 General methods - 38
3.3.2 Solar cell fabrication - 38
3.3.3 Measurement - 39
3.4 Conclusion - 40
3.5 Reference - 40
