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(a) Characteristics of photocurrent vs electrical field for (squares) and (dots) PV cells. Inset: current density-voltage characteristics of and cells measured under dark (squares) and the light illumination at (dots). (b) Photoluminescence quenching as a function of applied electric field for (squares) and (dots) cells. Inset: UV-vis absorption spectra for and solid films.
Normalized short-circuit PC action and absorption spectra for (a) and (b) devices. The squares and dots represent the PC action spectra when the light illumination was applied from the ITO and the Al sides, respectively. Inset in (a) gives vs characteristics for device. Inset in (b) shows thickness-dependent photocurrent for and cells.
(a) MFP for the (squares) and (dots) PV cells. The MFP is defined as the relative change in photocurrent: , where and are the photocurrents with and without magnetic field , respectively. (b) Excitation and dissociation processes in organic PV cells. and represent singlet and triplet excitons, respectively. and are singlet and triplet polaron pairs, respectively.
(a) MFP for double-layer PV cell of . (b) Band diagram together with enforced triplet-charge reaction in the double-layer PV cell. The LUMO and HOMO of BCP are 3.2 and , respectively (Ref. 32). (c) Photocurrents from single- and double-layer PV cells.
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