187. 2D HYBRID MULTILAYERED GRAPHENE/QUANTUM DOT PHOTOVOLTAIC SOLAR CELLS

Department: NanoEngineering
Research Institute Affiliation: Center for Magnetic Recording Research (CMRR)
Faculty Advisor(s): Oscar Vazquez Mena

Primary Student
Name: Malcolm Xaviera Lockett
Email: mxlocket@ucsd.edu
Phone: 916-990-4975
Grad Year: 2020

Abstract
This project aims to increase the efficiency of photovoltaic solar cells by increasing the overall thickness of the film by synthesizing multiple intercalated layers of graphene and quantum dots. Quantum dot photovoltaic cells have a diffusion length (~200nm) that limits the thickness of the film. With an increased thickness the quantum dot film will have increased absorption efficiency but will lose charge extraction efficiency due to the electron/hole recombination within the film before reaching the electrode contacts. Graphene is a thin 2D structure with high electron mobility but is poor at absorbing light. Quantum dots are a solution processed film that has high light absorption but low electron mobility. The combination of the two materials has been proven to increase the response in photodetectors, giving good indication of higher efficiency in photovoltaic devices. The first experiment consists of attaching top and bottom graphene contacts onto the quantum dot film and analyzing the charge transfer mechanics from the quantum dots to graphene. The next experiment is create multiple intercalated layers of graphene and quantum dots and analyze the effect the thickness has on the efficiency of the system. This 2D hybrid graphene ? quantum dot system is thin enough to be suitable for flexible devices, portable devices, other photo detectors and optoelectronics.

Industry Application Area(s)
Electronics/Photonics | Energy/Clean technology

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