광소재 연구 QDSC (Quantum Dot Solar Cell)

광소재 연구 QDSC (Quantum Dot Solar Cell) [광소재 연구] QDSC (Quantum Dot Solar Cell).pptx 목차 1. Introduction What is QDSC Solar cell & Quantum dot 2. Q.D.S.C Principle Structure Trend & Prospect 3.Conclusion 본문 Absorption: 외부에서 photon이 흡수되는 과정으로, semiconductor의 bandgap보다 큰 에너지를 가지는 경우에만 흡수 된다. 단 bandgap보다 너무 큰 경우는 auger electron을 생성하므로 실질적인 absorption을 일으키지 못한다. Generation: absorption으로 electron이 excite 되면서 electron-hole pair가 생성된다 Separation:이 두 carrier들이 다시 recombination 되지 않도록 separation 되어야 한다. Collection: electron과 hole을 collect 하여 photocurrent 가 생성된다. Quantum dots are particles of semiconductor material with the size so small that the electron energies that can exist within them are limited. These energy levels, defined by the size of quantum dots, in turn define the bandgaps. The dots can be grown to any needed size, allowing them to be tuned across a wide variety of bandgaps without changing the underlying material or construction techniques.[6]&nbsp;In typical preparations, the tuning is accomplished by varying the duration or temperature of synthesis. 본문내용 QDSC(Quantum Dot Solar Cell) Introduction 5 Why ‘QD’+SC? Introduction Efficiency ↑ of solar cell * Nowadays the efficiency of solar cell is about 20% * 6 Solar cell Device that absorbs photons from sun and generate current Introduction 7 1.Absorption 2.Generation 4.Collection 3.Separation Introduction Photocurrent Process 8 Quantum Dot Particles of semiconductor material with the size so sm 참고문헌 <김우석, 황화납/산화아연 나노선을 이용한 양자점감응형 태양전지, 2010> <전자통신동향분석 제22권 제5호 2007년 10월> http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=C1CC11317H http://blog.naver.com/PostView.nhn?blogId=twkim2004&logNo=70135186874 http://www.cheric.org/ippage/p/ipdata/2009/03/file/p200903-701.pdf http://www.californiascientific.com/resource/Solar%20Cell.pdf http://en.wikipedia.org/wiki/Solar_cell_efficiency