Structure and processing engineering for efficient PbS colloidal quantum dot solar cells효율적인 PbS 콜로이드 양자점 태양전지 제작을 위한 구조 및 공정 연구

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Due to their unique, size-dependent optical, electronic, optoelectronic properties, colloidal quantum dots (QDs) have attracted a great deal of attention for potentially widespread use in optoelectronic devices such as light-emitting diodes and photodetectors. In addition, colloidal QDs are solution-processable at a low temperature, and on this basis are also promising candidate material systems for low-cost, high-efficiency solar cells. With these advantages, there has been growing interest in quantum dot solar cells (QDSCs) as next-generation photovoltaic devices. In particular, lead sulfide (PbS) and lead selenide (PbSe) QDs have large Bohr radii, providing a strong quantum confinement effect and a facile tunability of band gap energy ($E_g$). These advantages also offer better carrier transport characteristics and wide spectral responses for photovoltaic applications. As a result, the performance of PbS and PbSeQDSCs has shown rapid improvements over the last few years. Although there has been rapid progress in QDSCs, there remain challenges to be solved for further improvement. In this thesis, we study the engineering of structure and processing of PbS QDSCs. Specifically, in the chapter 2 and 3, we focus on the interface defects at the junction and depletion region width of the QDSCs to improve the device performance. In the chapter 4, we report single-step fabrication of large-scale QD films from a colloidal quantum dot ink solution, which can expand the fabrication process from lab-scale to large-scale. The QDSCs are next-generation photovoltaic devices which have great potential and promising result. By engineering device structure, much improvements of device performance are exhibited in this thesis. We also demonstrate a new methodology enabling directly fabrication of large-scale QD film. We expect that these results can be highly useful for the further improvement of efficiency in QDSCs and the realization of high-throughput fabrication of QDSCs.
Advisors
Jung, Yeon Sikresearcher정연식researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2017.2,[ix, 123 p. :]

Keywords

Colloidal quantum dots▼asolar cells▼aPbS▼ainterface states▼adepletion region▼alarge-scale fabrication; 콜로이드 양자점▼a태양전지▼a황화납▼a계면 결함▼a공핍 영역▼a대면적 제조

URI
http://hdl.handle.net/10203/265027
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=866963&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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