Radiative efficiency limit with band tailing exceeds 30% for quantum dot solar cells

0483467 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Jean, J. - Mahony, T.S. - Bozyigit, D. - Sponseller, M. - Holovský, Jakub - Bawendi, M.G. - Bulovic, V.
Radiative efficiency limit with band tailing exceeds 30% for quantum dot solar cells.
ACS ENERGY LETTERS. Roč. 2, č. 11 (2017), s. 2616-2624. ISSN 2380-8195. E-ISSN 2380-8195
Grant CEP: GA MŠMT(CZ) LTC17029
Institucionální podpora: RVO:68378271
Klíčová slova: optical-absorption edge * PBS nanocrystal * amorphous-silicon * thin-films
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 12.277, rok: 2017

We use photothermal deflection spectroscopy (PDS) to robustly characterize the absorption edge of lead sulfide (PbS) QD films for different bandgaps, ligands, and processing conditions used in leading devices. We also present a comprehensive overview of band tailing in many commercial and emerging PV technologies—including c-Si, GaAs, a-Si:H, CdTe, CIGS, and perovskites—then calculate detailed-balance efficiency limits incorporating Urbach band tailing for each technology. Our PDS measurements on PbS QDs show sharp exponential band tails, with Urbach energies of 22±1 meV for iodide-treated films and 24±1 meV for ethanedithiol-treated films, comparable to polycrystalline CdTe and CIGS films. From these results, we calculate a maximum efficiency of 31%—close to the ideal limit without band tailing. This finding suggests that disorder does not constrain the long-term potential of QD solar cells.

Trvalý link: http://hdl.handle.net/11104/0278765