Structure of pentacene/tetracene superlattices deposited on glass substrate

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Abstract
Pentacene/tetracene organic superlattices were formed by deposition on a glass substrate, and their structure was investigated by x‐ray diffraction and photoluminescence. For samples in which the number (n) of constituent pentacene (or tetracene) molecular layers within a period is such that n≥3, the first‐order x‐ray diffraction peak was found to consist of several equally spaced subpeaks. Comparison of the spectra with calculated structure factors established that a well‐defined superlattice structure was achieved in these samples. In contrast, samples with n<3 showed no evidence of superlattice formation. Photoluminescence spectra show clear correlation with the x‐ray results.