Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01g732d909j
 Title: Tuning the Photoresponse of CuFeO2 with Mg Doping Authors: Wuttig, Anna Lydia Nakamura Advisors: Cava, Robert J.Bocarsly, Andrew B. Department: Chemistry Class Year: 2013 Abstract: The influence of semiconductor photoelectrodes’ carrier concentration on their photoresponse is a long hypothesized, but hitherto not quantitatively approached avenue to optimize materials for photoelectrochemical electrode applications. Here, I report tuning of CuFeO$$_{2}$$ photoelectrodes using Mg doping to demonstrate the effects of carrier concentration on the photoresponse by combining a variety of solid-state chemistry and photoelectrochemical methods. After synthesizing dense ($$\ge$$85% theoretical), pure, Mg-incorporated pellets (CuFe$$_{1-x}$$Mg$$_{x}$$O$$_{2}$$, x = 0, 0.0005, 0.005, 0.02), carrier type and concentrations were quantitatively assessed using the Hall Effect as well as the samples’ resistivities and majority carrier mobility. The same samples were used in a newly designed photoelectrochemical cell to measure their photoresponse. I observe that carrier concentration cannot be independently tuned. In the CuFe$$_{1-x}$$Mg$$_{x}$$O$$_{2}$$ system,optimization of the photoresponse by carrier concentration alone is not possible due to coupled electronic effects, changing the nature of the majority carrier type near the saturation limit (x$$\ge$$0.05). To this end, I also explore possible defect chemistries giving rise to varying electronic and photoresponses. I find that the photoresponse is directly correlated to the majority carrier mobility. Extent: 67 pages URI: http://arks.princeton.edu/ark:/88435/dsp01g732d909j Access Restrictions: Walk-in Access. This thesis can only be viewed on computer terminals at the Mudd Manuscript Library. Type of Material: Princeton University Senior Theses Language: en_US Appears in Collections: Chemistry, 1926-2016