Work Function Tuning for High-Performance Solution: Processed Organic Photodetectors with Inverted Structure

摘要

Solution-processed organic electronics offer good opportunity for the fabrication of cost-efficient functional devices. In particular, in the field of organic-based photoactive devices, photovoltaic cells (OPVs) have been attracting considerable attention.'1' Obviously, organic photodetectors (OPDs) have been less studied though they show great potential in various applications. Fabrication of photodetectors based on inorganic materials suffer from limitations such as vacuum step deposition, high temperature and long process cycles. At the opposite, the use of soluble π-conjugated organic semiconductors opens the way for high throughput printing processes and integration on large and flexible substrates. Nevertheless performances have to be improved in particular to circumvent the disadvantageous low charge carrier's mobility and low permittivity of organic semiconductors ' The photoconversion can be efficiently achieved by the use of a bulk heterojunction (BHJ) layer sandwiched between two electrodes.'