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Proceedings Paper

Junctionless thin-film ferroelectric oxides for photovoltaic energy production
Author(s): Farnood K. Rezaie; Deep Panjwani; Janardan Nath; Christopher J. Fredricksen; Isaiah O. Oladeji; Robert E. Peale
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Paper Abstract

Streaming Process for Electrode-less Electrochemical Deposition (SPEED) method is used to create complex thin-film structures, such as KBNNO, in a single step, in contrast to hydrothermal approaches with separate nanoparticle growth and deposition processes. This new ferroelectric oxide [KNbO3]1-x[BaNi1/2Nb1/2O 3-δ]x or “KBNNO” has an alloy-tunable band gap as low as 1.1 eV, so that its absorption can be tailored to match the solar spectrum. At the same time, it has a reasonably large polarization allowing for charge separation across the bulk, sizeable photocurrents, and open-circuit voltages Voc that exceed the band gap, potentially leading to efficiencies that exceed those possible for standard pnjunction cells. Physical characterization of KBNNO films demonstrate the microstructure and stoichiometry of SPEEDproduced thin-films, ratio of elements needed to achieve an ideal band gap of ~1.39 eV, the effect on film chemistry, microstructure, and band gap of annealing, the practical separation of excited carriers at room temperature, the maximum achievable polarization and its temperature dependence, and the conditions for ideal poling. Photovoltaic characterization of KBNNO cells will determine the efficiency, the relative strengths of dark and photo currents, the open circuit voltage, the short circuit current, and cell fill factor (FF).

Paper Details

Date Published: 5 June 2014
PDF: 7 pages
Proc. SPIE 9115, Energy Harvesting and Storage: Materials, Devices, and Applications V, 91150Q (5 June 2014); doi: 10.1117/12.2050707
Show Author Affiliations
Farnood K. Rezaie, Univ. of Central Florida (United States)
Deep Panjwani, Univ. of Central Florida (United States)
Janardan Nath, Univ. of Central Florida (United States)
Christopher J. Fredricksen, Univ. of Central Florida (United States)
Isaiah O. Oladeji, SISOM Thin Films, LLC (United States)
Robert E. Peale, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 9115:
Energy Harvesting and Storage: Materials, Devices, and Applications V
Nibir K. Dhar; Palani Balaya; Achyut K. Dutta, Editor(s)

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