Subphthalocyanines to achieve broad spectral absorption and produce a photocurrent in an organic solar cell

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The amount of electrical energy (voltage) which can be drawn from a solar cell is proportional to the number of photons absorbed (N), the quantum efficiency of converting those photons to electrical charge (QE) and inversely proportional to wavelength of the photons. Therefore in order to increase the amount of voltage produced, an increase in N and/or QE or a reduction in the wavelength of the absorbed photons is needed. This proposal seeks to increase N through broad spectral absorption of sunlight by subphthalocyanine (subPc) crystals either on their own or as a mixture with other subphthalocyanine or phthalocyanine crystals. At the same time, the supramolecular arrangement of the new subPcs within the crystal will be studied in order to maximize QE.