Single-junction OPVs

OPV materials that can operate with a band gap of 1.1-1.3 eV have, so far, not been made. Several successful donor polymers have been synthesized that absorb light to energies as low as 1.3 eV. But the most commonly used acceptor, PCBM, has a band gap of 1.75 eV, which is ultimately the limiting factor for efficiency [9]. Several different electrical device models have been used to calculate the maximum possible PCE of an OPV device [9-11]. All three models give a maximum PCE for a single junction device of 10-11%. The model by Veldman et al. predicts the maximum possible Voc to be [9] ... 

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