Engineering Commons^™

Enhancing Thermal Stability Of Perovskite Solar Cells With A Polymer Through Grain Boundary Passivation, Tanzila Tasnim Ava

Electrical & Computer Engineering Theses & Dissertations

Organic-inorganic halide perovskite solar cells have emerged as a promising photovoltaic technology due to their superb power conversion efficiency (PCE) and very low material costs. While perovskite solar cells are expected to eventually compete with existing silicon-based solar cells on the market, their long-term stability has become a major bottleneck. In particular, perovskite films are found to be very sensitive to external factors such as air, UV light, light soaking, thermal stress and others. Among these stressors, light, oxygen and moisture-induced degradation can be slowed by integrating barrier or interface layers within the device architecture. However, the most representative perovskite …

Effect Of Grain Size And Interface Engineering On The Photovoltaic Performance And Stability Of Perovskite Solar Cells, Abdullah Al Mamun

Electrical & Computer Engineering Theses & Dissertations

Organic-inorganic halide perovskite solar cells (PSCs) have grown rapidly in recent years due to their outstanding optoelectronic properties, high efficiency, and low-cost. However, this emerging solar cell technology is experiencing some challenges such as defects, hysteresis, and long-term stability, which need to be addressed in order to make it commercially available. This dissertation aims to assist in overcoming some of the barriers and is therefore important to the field of perovskite solar cells.

Initially, this dissertation focuses on investigating the role of grain interiors (GIs) and grain boundaries (GBs) of perovskite film using chemically, spatially, and temporally resolved measurements at …

New Method Of Nickel Oxide As Hole Transport Layer And Characteristics Of Nickel Oxide Based Perovskite Solar Cell, Loi Nguyen

Electrical & Computer Engineering Theses & Dissertations

For perovskite solar cells, poly (2,3-dihydrothieno-1, 4-dioxin)-poly (styrenesulfonate) (PEDOT:PSS) is a common hole transport layer. However, PEDOT:PSS has a lot of drawbacks, such as irregular quality from distributors, poor electron blocker, and hygroscopic nature. On the other hand, NiOx has been reported that it can provide good stability and carrier mobility. From literature, NiOx was used to replace PEDOT:PSS as a hole transport layer with positive results since it is transparent as a thin film and also possesses compatible work function in perovskite solar cell bandgap alignment. In depositing NiOx as a thin film, many approaches have been developed. However, …

Improved Thermal Stability Of Cesium-Doped Perovskite Films With Pmma For Solar Cell Application, Christine M. Gausin

Electrical & Computer Engineering Theses & Dissertations

Perovskite solar cells (PSCs) have the potential to replace the traditional silicon solar cells for commercialization applications. Perovskites offer a lower cost to fabrication, superb efficiencies, high absorption coefficients, longer carrier lifetime and diffusion lengths. Despite their improved efficiency, perovskites suffer from several degradations relating to the material’s organic-inorganic composition upon exposure to different environmental conditions. In general, the main causes of degradation of perovskite films are due to exposure to moisture, oxygen, air, light, and temperature. Several efforts have been made to stabilize perovskites including encapsulation, doping of cations, and alterations to the perovskite structure. In this work, we …