Figure 5
From: Broadband energy transfer to sensitizing dyes by mobile quantum dot mediators in solar cells
Two-photon absorption (TPA) and its photon-to-current efficiency.
(a) Absorption of four different CdSe QDs in toluene with two distinct peaks in the visible range (~450 nm to 600 nm) and near–IR range (~900 nm to 1200 nm). (b) Absorption of the CdSe QDs in ionic liquid at the near IR range. (c) The near–IR EQE of cells with QDs. (d) Absorbed photon–to–current efficiency (APCE) of cells with QDs versus ћω/Eg(the incoming photon energy divided by each QD band gap) showing broad spectral spreading in which the TPA transition is represented by six peaks (dashed blue lines), three of which match well with theoretical simulation [16](solid blue lines). The thickness of the TiO2 photo–electrode is ~8 μm and the data were measured under the AM 1.5 G standard.
