Abstract
We have demonstrated that the external quantum efficiency (EQE) of organic photovoltaic cells with a heterojunction of zinc phthalocyanine (ZnPc) and fullerene (C60) bilayer films, which are used as a donor and an acceptor, respectively, is improved by photopolymerization (photon energy: 2–4 eV and light fluence: 0.4 W cm−2) between adjacent C60 molecules via a [2 + 2] cycloadditional four-membered ring. Comparison of the structural and physical properties of ZnPc, C60, and ZnPc/C60 bilayer films between before and after photoirradiation indicated that an increase in the number of photogenerated intra- and inter-molecular excitons in photopolymerized C60 film mainly contributes toward improvement of the EQE in a wavelength range of 400–600 nm.
Highlights
Energy harvesting technologies play a key role in developing our future sustainable society with SDGs (Sustainable Developing Goals)
It is necessary to increase both short-circuit current (Jsc) and open-circuit voltage for improving the η of Organic photovoltaic cells (OPVs). For the former case, it is important to understand four elemental processes, namely, (i) excitons photogenerated in the D and A films, (ii) diffusion of the excitons to the D–A interface, (iii) the excitons separated to carriers at the interface, and (iv) these carriers moving to each electrode
We have investigated how the structural and physicochemical properties of donor (D) and acceptor (A) films influence elemental processes (i) and (ii) for OPVs with a heterojunction between zinc phthalocyanine (ZnPc) and fullerene (C60) thin films that are used as D and A, respectively,5 because ZnPc/C60 OPVs with a welldefined D/A heterojunction are indispensable for understanding these influences
Summary
Energy harvesting technologies play a key role in developing our future sustainable society with SDGs (Sustainable Developing Goals). We have investigated how the structural and physicochemical properties of donor (D) and acceptor (A) films influence elemental processes (i) and (ii) for OPVs with a heterojunction between zinc phthalocyanine (ZnPc) and fullerene (C60) thin films that are used as D and A, respectively, because ZnPc/C60 OPVs with a welldefined D/A heterojunction are indispensable for understanding these influences.. We examined the morphological and optical properties of α- and β-phase ZnPc films in order to improve the external quantum efficiency (EQE), which is relevant to Jsc, of ZnPc/C60 OPVs from a viewpoint of structural modification of the donor and found that the former OPV (α-phase) exhibits ∼2 times higher EQE than the latter one (β-phase) in the wavelength range of 400–800 nm. We have investigated how the structural and physicochemical properties of donor (D) and acceptor (A) films influence elemental processes (i) and (ii) for OPVs with a heterojunction between zinc phthalocyanine (ZnPc) and fullerene (C60) thin films that are used as D and A, respectively, because ZnPc/C60 OPVs with a welldefined D/A heterojunction are indispensable for understanding these influences. Recently, we examined the morphological and optical properties of α- and β-phase ZnPc films in order to improve the external quantum efficiency (EQE), which is relevant to Jsc, of ZnPc/C60 OPVs from a viewpoint of structural modification of the donor and found that the former OPV (α-phase) exhibits ∼2 times higher EQE than the latter one (β-phase) in the wavelength range of 400–800 nm.
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