High Performance Organic Ultraviolet Photodetectors Based on m-MTDATA

摘要

We demonstrate highly efficient organic ultraviolet photodetectors using 4,4',4" -tris[3-methyl-pheny(phenyl) amino] triphenylamine (m-MTDATA) and aluminum Tris(8-Hydroxyquinolinate) Synonym Alq3). The 2 optimized photodetector delivers a photocurrent of 1.40 mA/cm at10 V, corresponding to a response of 127 mA/W under an illumination of 375 nm UV light irradiation with an intensity of 10.5 mW/cm~2 and a detectivity of 2.15x10~(11) cm Hz~1/~2 /W. The high response is attributed to the larger band offset at m-MTDATA/Alq_3 heterojunction, the suppression of radiative decay of m-MTDATA and efficient electron transfer from m-MTDATA to Alq_3. The working mechanism of harvesting high performance is also discussed in detail.