| 초록 |
Organic photodetectors (OPDs) overcome the disadvantages of the traditional inorganic photodetectors in terms of their unique features, such as rich in varieties, light weight, ease of processing, large-area scalability, and high flexibility. Among them, photo-responsive materials used in OPDs have low band gap energy, and dark current is likely to occur by other factors except light. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was used as typical hole transport layer. The contact angle between a liquid film and a solid substrate is treated in the van der Waals Model, and it has an important role in defects and dark current between the interfaces. We mainly improved the dark current, using the Hydrophobic modified PEDOT:PSS-co-TF (TF) and hydrophilic modified PEDOT:PSS-co-PA (PA) instead of PEDOT:PSS. The TF leads to suppressed defects, followed by a sharp decrease in the dark current of TF-based OPDs by 5.60 × 10-8 A/cm2 from 1.05 × 10-6 A/cm2 at -1V. |
