Using a fast hybrid pixel detector for dose-efficient diffraction imaging beam-sensitive organic molecular thin films

Abstract We discuss the benefits and showcase applications of using a fast, hybrid-pixel detector (HPD) for 4D-STEM experiments emphasize that in diffraction imaging structure molecular nano-crystallites organic solar cell thin films with dose-efficient modality 4D-scanning confocal electron (4D-SCED). With 4D-SCED, spot patterns form from an interaction area few nm while beam rasters over sample, resulting high dose effectiveness yet highly demanding on frame speed, sensitivity, single-pixel count rate. compare datasets acquired 4D-SCED fast HPD those state-of-the-art complementary metal-oxide-semiconductor (CMOS) cameras to map in-plane orientation π -stacking small molecule DRCN5T blend DRCN5T: PC 71 BM after solvent vapor annealing. The high-speed CMOS camera, scintillator optimized low doses, showed impressive results sensitivity noise. However, limited speed restricted practical experimental conditions caused unintended damage weak nano-crystallites. HPD, three orders magnitude higher, allows much higher probe current lower total more scan points cover large field view less time. A lot faint signals correspond just events are detected. improved performance direct detectors opens possibilities enhance characterization beam-sensitive materials techniques.