Light excitation Anomalous behavior 1 Atomic force 1 Atomic scale 1 Bias conditions 1 Bias levels 1 Efficiency 1 Electron tunneling 1 Forward bias 1 Higher efficiency 1 Hydrogen bonds 1 Intensity-dependent 1 Light-induced 1 Lows-temperatures 1 Microscope systems 1 Microscopes 1 Multiphonons 1 Optical data processing 1 Optical experiments 1 Optical measurement 1 Organic solar cells 1 Probe microscope 1 Quantum efficiency 1 Scanning 1 Scanning probes 1 Scanning tunneling microscopy 1 Shockley-Read-Hall models 1 Temperature 1 Trap filling 1