Study on fundamentals of colloidal quantum dots for highly efficient photovoltaics = 고효율 콜로이드 양자점 태양전지에 관한 기초 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 222
  • Download : 0
Colloidal quantum dots (CQDs) are good candidate materials for next generation solar cells because of bandgap tunability in broad range, solution processibility, and suppressed thermal energy loss of carriers. However, the state of art power conversion efficiency (PCE) of CQD photovoltaics (PVs) is around 11%, which is lower than PCE of commercialized solar cells. Poor electrical property of CQDs compared to bulk materials is one of the biggest reasons for relatively low PCE of CQD PVs. PCE of CQD PVs can be improved by controlling the surface since surface of CQDs with high surface to volume ratio strongly affects electrical properties. More specifically, based on understanding the effect of surface to optoelectronic properties in CQDs, their energy band structures, doping level, mobility of electrons and holes, and photoelectric conversion stability can be modulated. In this thesis, CQD PVs with high PCE were realized by investigating electrical and photoelectric conversion properties. It has been revealed that the properties of CQD PVs are dependent on solvent used during the formation of active layer and surface molecules. In particular, it turned out that the number of surface traps, the mobility of electrons and holes, and the photoelectric conversion properties are highly sensitive on acidity of protic solvents which are treated on CQD surface. Moreover, hysteresis-free and photostable CQD PVs were obtained by investigating the correlation between the hysteresis in current-voltage curves and the mobile ions from organic ligands on the surface of CQDs.
Advisors
Kim, Yong-Hyunresearcher김용현researcher
Description
한국과학기술원 :나노과학기술대학원,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 나노과학기술대학원, 2017.2,[xi,92 p. :]

Keywords

Colloidal quantum dots; Solar cells; Surface; PbS; Hysteresis; 양자점; 태양전지; 표면; 황화납; 이력현상

URI
http://hdl.handle.net/10203/241739
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675668&flag=dissertation
Appears in Collection
NT-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0