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Open-circuit voltage deficit, radiative sub-bandgap states, and prospects in quantum dot solar cells
C.-H.M. Chuang, A. Maurano, R.E. Brandt, G.W. Hwang, J. Jean, T. Buonassisi, V. Bulović, and M.G. BawendiNano Letters 15, 3286–3294 (2015)