Tailoring the Grain Boundaries of Wide-bandgap Perovskite Solar Cells by Molecular Engineering

Author

Khalid Emshadi, South Dakota State UniversityFollow

Document Type

Dissertation - Open Access

Award Date

2020

Degree Name

Doctor of Philosophy (PhD)

Department / School

Electrical Engineering and Computer Science

First Advisor

Quinn Qiao

Keywords

Perovskite, Photovoltaics, Semiconductors, Solar Cells, Solar Energy

Abstract

Due to the attraction of fabricating highly efficient tandem solar cells, wide-bandgap perovskite solar cells have attracted substantial interest in recent years. However, polycrystalline perovskite thin-films show the existence of trap states at grain boundaries, which diminish the optoelectronic properties of the perovskite and thus remains a challenge. This research demonstrates a one-step solution-processing of the [MA_0.9Cs_0.1Pb(I_0.6Br_0.4)3] wide-bandgap perovskite using Phenylhydrazine Iodide with amino groups to successfully passivate the trap density within grain boundaries and increase the perovskite grain size. The reinforced morphology and grain boundaries treatment considerably enhanced the photovoltaic performance from an average of 10.7 ±0.6% for pristine to an average of 14.15 ±0.32% for the treated devices. This strategy can be quickly adapted to other perovskites and help realize highly efficient perovskite solar cells.

Library of Congress Subject Headings

Perovskite solar cells.
Grain boundaries.
Photovoltaic cells.

Format

application/pdf

Number of Pages

114

Publisher

South Dakota State University

Recommended Citation

Emshadi, Khalid, "Tailoring the Grain Boundaries of Wide-bandgap Perovskite Solar Cells by Molecular Engineering" (2020). Electronic Theses and Dissertations. 4092.
https://openprairie.sdstate.edu/etd/4092