Figure 6From: STM-induced light emission from thin films of perylene derivatives on the HOPG and Au substrates Bias voltage dependences of STM-LE spectra of PTCDI-C7 thin films on (a) HOPG and (b) Au substrates (It = 20 nA, acquisition time = 15 min). The arrow indicates the quantum cutoff energy (see text) of each sample voltage. The spectra are smoothened by averaging the 100 nearest points of the raw data.Back to article page