Intermediate band materials for high efficiency solar cells: overview and future directions Jacob J Krich Department of Physics & School of Electrical Engineering and Computer Science University of Ottawa
Collaborators uOttawa US Army Research Australian National MIT University Eduard Dumitrescu Jeff Warrender Tonio Buonassisi Quentin Hudspeth Jim Williams Akshay Krishna Austin Akey Philippe Chow Shao Qi Lim Kyle Robertson Christie Simmons Wenjie Yang Luc Robichaud Joe Sullivan McGill/Michigan Peter Rose Mark Winkler Zetian Mi Harvard Anna Trojnar Ashfiqua Connie Bertrand Halperin Josh Wheeler University of Dayton Hieu Nguyen Michael Aziz Matt Wilkins Jay Mathews Daixi Xia Dan Recht Yining Liu Stanford Emily Zhang Eric Mazur Aaron Lindenberg Karin Hinzer Toronto Middlebury Ross Cheriton Alán Aspuru-Guzik Renee Sher Alex Walker Jacob J. Krich University of Ottawa
Present topics in the group Intermediate band Nanowire PV Quantum biology/ materials nonlinear spectroscopy Delay Time T IB device modeling IB IR photodetectors Monochromatic PV Si:S (Sher 2014) 1-pass 10 0 2-pass α w light trapping 10 -2 10 -4 0.75 η 0.5 0.25 0 3 H 2 1 0 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 2 ν D Jacob J. Krich University of Ottawa
Outline • Intermediate band solar cells – 3 material classes • Figure of merit – Measurements – Predictions • New developments – InGaN quantum dots in nanowires – Device model Jacob J. Krich University of Ottawa
Standard PV Intermediate band PV n p n IB p Conduction Band E e E g Valence Band Max efficiency Standard IBPV PV Concentrated 41% 63% E g Unconcentrated 33% 47% Photon flux Photon flux E e E g Half è All è All photons carriers carriers è carriers Photon energy (eV) Photon energy (eV) Jacob J. Krich University of Ottawa
Detailed balance efficiency limits Full concentration E i Shockley-Queisser limit F F Krishna, Krich, J Optics (2016)
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