Publication Details (including relevant citation information):
Appl. Phys. Lett. 2010, 96(14), 3307.
Solar cells require symmetry-breaking features such as built-in electrostatic fields and/or effective fields. We examine an organic heterojunction structure with no built-in field and explore the origins of its current-voltage characteristics and open circuit voltage (Voc). Two behaviors are found: (1) Voc = Vi + m[(H(D) - (L(A)] where m ≈ 1, the intercept (Vi) is determined by interface recombination kinetics, H(D) is the donor highest occupied molecular orbital, and L(A) is the acceptor lowest unoccupied molecular orbital; (2) if interface recombination is suppressed, Voc is controlled by bulk/contact recombination and is not dependent upon H(D) - L(A).
Address (URL): http://dx.doi.org/10.1063/1.3383232