Study of small-molecule thin organic films deposited on porous silicon substrates

In this work time-resolved photoluminescence spectra (PL-TRS) under pulsed excitation of fresh porous silicon (PSi) and with thin copper phthalocyanine (CuPc) deposited on the top of such structure are presented. The PSi substrate have been by electrochemical etching method produced. The CuPc coating have been using physical vapor deposition (PVD) in high vacuum prepared. The PL-TRS of such structures were at room temperature at vacuum in microsecond delay range registered. We observed that PSi/CuPc samples exhibit strong photoluminescence in visible region. The registered PL-TRS spectra exhibit multiband structure. Comparison of PL-TRS for fresh PSi and PSi/CuPc structure shows that organic material can penetrate into PSi skeleton which leads to interaction between carriers in PSi and organic material deposited on the top of structure.