2010/12/08 by Tianli Feng, Tian-Li Feng, Guang-Wei Deng +15
Engineering · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Nanowire Synthesis and Applications #Photonic and Optical Devices #Quantum Physics (quant-ph) #Semiconductor materials and devices #cond-mat.mtrl-sci #quant-ph
paper · pdf · doi:10.48550/arxiv.1012.1807
This paper has been withdrawn by the author due to a crucial sign error in the last description
openalex publication_date 2010/12/08 · arxiv created 2010/12/09 · arxiv updated 2010/12/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The novel concept of non-compensated n-p codoping has made it possible to create tunable intermediate bands in the intrinsic band gap of TiO2, making the codoped TiO2 a promising material for developing intermediate band solar cells (IBSCs). Here we investigate the quantum efficiency of such IBSCs within two scenarios - with and without current extracted from the extended intermediate band. Using the ideal equivalent circuit model, we find that the maximum efficiency of 57% in the first scenario and 53% in the second are both much higher than the Shockley-Queisser limit from single gap solar cells. We also obtain various key quantities of the circuits, a useful step in realistic development of TiO2 based solar cells invoking device integration. These equivalent circuit results are also compared with the efficiencies obtained directly from consideration of electron transition between the energy bands, and both approaches reveal the intriguing existence of double peaks in the maximum quantum efficiency as a function of the relative location of IBs.