Title :
Multiple exciton generation solar cells: Effects of nanocrystal shape on quantum efficiency
Author :
Marshall, Ashley R. ; Beard, Matthew C. ; Luther, Joseph M.
Author_Institution :
Univ. of Colorado Boulder, Boulder, CO, USA
Abstract :
Semiconductor nanocrystals (NCs) have the ability to perform a process, termed multiple exciton generation (or MEG), which produces two electrons for every absorbed photon. This has been experimentally confirmed using ultrafast spectroscopic techniques for many semiconductor NC families. The shape of the NCs has been found to play an important role in the efficiency of MEG. Spherical PbSe NCs have been used to fabricate devices that exhibit greater than 100% quantum efficiencies, here we report on the use of NC morphologies and hybrid NC assemblies that can increase the power conversion efficiency in a device.
Keywords :
IV-VI semiconductors; excitons; lead compounds; nanostructured materials; solar cells; PbSe; hybrid NC assembly; multiple exciton generation; nanocrystal shape; power conversion efficiency; quantum efficiency; semiconductor NC; semiconductor nanocrystals; solar cells; ultrafast spectroscopic techniques; Excitons; Films; Nanocrystals; Photonics; Photovoltaic cells; Quantum dots; Shape; Lead chalcogenides; multiple exciton generation; nanocrystals; photovoltaic cells;
Conference_Titel :
Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th
Conference_Location :
Denver, CO
DOI :
10.1109/PVSC.2014.6925101
