Energy transfer in the system of PbS quantum dots

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Journal ISSN

Volume Title

Sähkötekniikan korkeakoulu | Master's thesis

Date

2016-08-24

Department

Major/Subject

Micro- and Nanosciences

Mcode

ELEC3037

Degree programme

NanoRad - Master’s Programme in Nano and Radio Sciences (TS2013)

Language

en

Pages

50+0

Series

Abstract

This work is devoted the investigation of the process of nonradiative energy transfer via FRET mechanism between lead sulphide QDs of different size in the porous matrix and on the glass surface at both room and decreased temperatures. As a result, we observed quenching of photoluminescence (PL) for donors together with flare-up of PL of acceptors, which was accompanied by significant increasing of lifetimes of acceptors up to values characteristic for donors. This unexpected effect can be explained using three-level model which based on a complex energy structure of PbS quantum dots-donors, which are involved in the energy transfer. The observed effect can lead to a significant change in the dynamic characteristics of the charge carriers in quantum dot solar cells.

Description

Supervisor

Sopanen, Markku

Thesis advisor


Keywords

quantum dots, energy transfer, solar cells, luminescence

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