Document Type

Thesis - Open Access

Award Date

2020

Degree Name

Master of Science (MS)

Department

Electrical Engineering and Computer Science

First Advisor

Qiquan Qiao

Keywords

Additive material, Charge carrier dynamics, Defects passivation, Perovskite solar cell, Short circuit current density, Solar cell

Abstract

In the last few years, active research works on hybrid perovskite solar cells (HPSCs) have been going on throughout the world as a part of clean energy revolution. HPSCs have already proved their potentiality as future solar technology through their promising photovoltaic performances and ability for low temperature based solution processing. Nevertheless, still there are remaining challenges of better charge carrier dynamics and defects minimization in HPSCs. Overcoming these challenges are very important to achieve high power conversion efficiency (PCE) practically. Aiming this, a novel organic halide salt called Phenylhydrazinium Iodide (PHAI) is introduced as additive with CH3NH3PbI3 perovskite precursor in this study. Incorporation of a very small amount of PHAI causes significant enhancement of charge carrier dynamics in HPSCs resulting ~15% increase of device’s short circuit current density. In addition, PHAI treatment helps to reduce perovskite grain boundary defects more than 0.5 times than the pristine CH3NH3PbI3 HPSCs. This reduction in defects contributes to minimize the non-radiative recombination of photogenerated charge carriers. Consequently, overall 20% improvement in PCE is achieved through PHAI additive treatment providing ~18% efficient CH3NH3PbI3 inverted hybrid perovskite solar cells. Besides, PHAI treated HPSCs exhibit superior ambient stability than the pristine devices in unencapsulated condition.

Library of Congress Subject Headings

Perovskite solar cells.
Hybrid solar cells.
Halides.
Photovoltaic power generation.

Format

application/pdf

Number of Pages

79

Publisher

South Dakota State University

Rights

In Copyright - Educational Use Permitted
http://rightsstatements.org/vocab/InC-EDU/1.0/

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