Liu, Yulin
(2023)
High-performance Perovskite Solar Cell and Photocathode.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
ABX3-based organometal halide perovskite solar cells (OMH PSCs) have opened up a new overture in photovoltaic (PV) devices for sunlight harvesting. Methylammonium and formamidinium lead halides (MAPbI3 and FAPbI3) are the two most feasible structures due to their excellent optoelectrical performance and manageable deposition method. However, to stimulate the outspread applications of OMH PSCs in the field of industry, further progress on the improvement of their power conversion efficiency (PCE) and compatibility with related PV systems must be achieved. Therefore, this dissertation has put effort into PCE improvement of PSC devices. Near-infrared (NIR) plasmon particles have been utilized to improve the solar energy harvesting at the near-band edge of the MAPbI3. Moreover, we have also developed a new kind of electron transport layer (ETL)-SnO2. The efficient modification of the bottom interlayer between FAPbI3 and SnO2 has considerably decreased trapping sites and stabilized the perovskite growth. Finally, an inverted PSC structure has been assembled with noble metal free catalysts for solar-driven water splitting application.
Plasmon silica@silver (SiO2@Ag) core@shell particles with IR surface plasmon resonance wavelength are incorporated into MAPbI3-based PSC devices. Based on the position and concentration optimization, the IR plasmons can considerably increase the quantum efficiency in the near-band edge range of the devices, where typically the fragile part is. Investigation on light management and carrier dynamics includes wavelength-dependent photoluminescence (PL) analysis and electromagnetic simulation.
PbS quantum-dot modification has been employed to promote the SnO2 ETL-based PSCs. An ultrathin interfacial layer between planar SnO2/FAPbI3 simultaneously passivated the trapping sites, induced perovskite growth and decreased energy level mismatch. As a result, incredible current-voltage performance improvement and elongated stability are attained due to the reduction of nonradiative carrier recombination.
Finally, PSC devices are extended to convert solar energy to water splitting in a versatile method with molybdenum carbide (Mo2C)-based catalysts. Commercially purchased metal foil-Titanium foil has been deployed here as a protection layer for the PSC devices and also the substrate for the earth-abundant catalysts. The hybrid photocathode structure PSC/Ti/Mo2C can be directly immersed into an acid electrolyte solution for hydrogen evolution over 10 hours.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
19 January 2023 |
| Date Type: |
Publication |
| Defense Date: |
4 October 2022 |
| Approval Date: |
19 January 2023 |
| Submission Date: |
7 October 2022 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
146 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering and Materials Science |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Perovskite Solar Cell, Photocathode, Solar Energy, Water Splitting |
| Date Deposited: |
19 Jan 2023 19:07 |
| Last Modified: |
19 Jan 2023 19:07 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/43726 |
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