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Article

Research Paper

Journal of the Optical Society of Korea 2015; 19(3): 272-276

Published online June 25, 2015 https://doi.org/10.3807/JOSK.2015.19.3.272

Copyright © Optical Society of Korea.

Charge Transport Characterization of PbS Quantum Dot Solids for High Efficiency Solar Cells

Young Jin Jeong1, Jihoon Jang1, Jung Hoon Song1, Hyekyoung Choi1, Sohee Jeong1, and Seung Jae Baik2

1Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials; 2Department of Electrical, Electronic, and Control Engineering, Hankyong National University

Received: January 5, 2015; Revised: February 24, 2015; Accepted: February 26, 2015

Abstract

The PbS quantum dot is an emerging photovoltaic material, which may provide high efficiency breakthroughs. The most crucial element for the high efficiency solar cells's development is to understand charge transport characteristics of PbS quantum dot solids, which are also important in planning strategic research. We have investigated charge transport characteristics of PbS quantum dot solids thin films using space charge limited conduction analysis and assessed thickness dependent photovoltaic performances. The extracted carrier drift mobility was $low-10^{-2}cm^2/Vs$ with the estimated diffusion length about 50 nm. These and recently reported values were compared with those from a commercial photovoltaic material, and we present an essential element in further development of PbS quantum dot solids materials.

Keywords: Colloidal quantum dot, Quantum dot solids, Space charge limited conduction, Thickness dependence of photovoltaic performance,

OCIS codes: 160.5335; 160.6000; 310.6845; 310.3840

Optical Society of Korea

Current Optics
and Photonics


Min-Kyo Seo,
Editor-in-chief

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