Faculty Advisor

Brodeur, Drew R

Faculty Advisor

Deskins, N Aaron

Faculty Advisor

Rao, Pratap M.

Abstract

Metal sulfides with moderate band gaps are desired for efficient generation of electricity or fuels from sunlight. Bi2S3, with a band gap of 1.3 eV, has been commonly synthesized by the successive ionic layer adsorption and reaction to produce nanocrystalline films. Annealing of the solution-processed Bi2S3 nanocrystals has been attempted at low temperatures, which may not improve crystallinity. Here, we report a highly crystalline and phase-pure Bi2S3 thin film photoelectrode synthesized by high-temperature annealing of the solution-processed nanocrystalline film in a sulfur vapor environment. The sulfur-annealed Bi2S3 thin film exhibits significantly enhanced light absorption and photoexcited carrier lifetime compared to the un-annealed film.

Publisher

Worcester Polytechnic Institute

Date Accepted

April 2017

Major

Interdisciplinary

Project Type

Major Qualifying Project

Accessibility

Unrestricted

Advisor Department

Chemistry and Biochemistry

Advisor Department

Chemical Engineering

Advisor Department

Mechanical Engineering

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