Figure 1.

Different STM images of PTCDA on Cu(100). (a) Ordered structure observed after deposition at a sample temperature of 400 K. The upper left corner shows the bare Cu(100) surface. The unit cell of the structure is indicated (U_bias = −1.2 V, I_T = 68 pA, 21.6 × 21.6 nm², θ ≈ 0.5 ML). (b) Misfit area between two translational domains. The black lines are guide lines for the eye. The unit cells are indicated (U_bias = −0.8 V, I_T = 63 pA, 16.3 × 16.3 nm²). (c) PTCDA agglomerates after annealing at 550 K for 5 min (U_bias = −1.9 V, I_T = 91 pA, 47.5 × 47.5 nm²).