Two-dimensional diffusion of excitons in a perylene diimide monolayer quenched by a fullerene heterojunction: Raw Data Figures and data locations: AFM images are saved as .ibw files. Fluorescence spectra are saved as both .ls6 and .txt files. Main Text Figure 1b: AFM->PTCDI->27.07.2018->PTCDI_180718_A20059.ibw Figure 1c: AFM->PTCDI-> PTCDI_240417_F10002.ibw Figure 1d: AFM->C60->23.05.2017_JK-> C60_hBN_2403170017.ibw Figure 1d (inset): AFM->C60-> 20.11.2014_SAS-> C60BN_50051.ibw Figure 1e: AFM->C60-> 05.05.2017_JK-> C60_hBN_2110160002.ibw Figure 2a: AFM->PTCDI_C60-> 26.10.2016_JK C60-PTCDI_0pt3ML-> C60_PTCDI_BN_26100005.ibw Figure 2b: AFM->PTCDI_C60-> 26.10.2016_JK C60-PTCDI_0pt3ML-> C60_PTCDI_BN_26100003.ibw Figure 2c: AFM->PTCDI_C60-> 26.10.2016_JK C60-PTCDI_0pt3ML-> C60_PTCDI_BN_26100007.ibw Figure 2f: AFM->PTCDI_C60-> 11.11.2016_JK C60-PTCDI_0pt6ML-> C60pt6_PTCDI_09110008.ibw Figure 2g: AFM->PTCDI_C60-> 21.11.2016_JK C60-PTCDI_0pt9ML-> C60_PTCDI_161116_0005.ibw Figure 3: Fluorescence->07.06.2018_JK SI Figure SI 1: AFM->PTCDI-> 03.09.15_JK (Room temperature growth) AFM->PTCDI-> 09.09.15_JK (54 °C growth) AFM->PTCDI-> 15.09.15_JK (100 °C growth) AFM->PTCDI-> 17.09.15_JK (135 °C growth) Figure SI 2: AFM->PTCDI-> 281015_JK (0.6 ML and 0.9 ML coverage) AFM->PTCDI-> 051115_JK (1.8 ML coverage) AFM->PTCDI->281015_JK (2.7 ML coverage) AFM->PTCDI->301015_JK (4.5 ML coverage) Figure SI 3: AFM->C60 Figure SI 3: AFM->C60-> 12.04.2017_JK Nomenclature: A denotes room temperature growth, the following number denotes the coverage from 0.4 to 1.6 ML. B denotes growth at 214 °C with coverage ranging from 0.4 ML (1) to 2.9 ML (4). Figure S8: AFM->PTCDI_C60->06.06.2018_JK