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Organic materials are suitable for light sensing devices showing unique features such as low cost, large area, and flexibility. Moreover, transparent photodetectors are interesting for smart interfaces, windows, and display-integrated electronics. The ease of depositing ultrathin organic films with simple techniques enables low light absorbing active layers, resulting in the realization of transparent devices. Here, we demonstrate a strategy to obtain high efficiency organic photodetectors and phototransistors based on transparent active layers with a visible transmittance higher than 90%. The photoactive layer is composed of two phases, each a few nanometers thick. First, an acceptor polymer, which is a good electron-transporting material, on top of which a small molecule donor material is deposited, forming noncontinuous domains. The small molecule phase acts as a trap for holes, thus inducing a high …
American Chemical Society
Publication date: 
30 Aug 2017

Lorenzo Caranzi, Giuseppina Pace, Mauro Sassi, Luca Beverina, Mario Caironi

Biblio References: 
Volume: 9 Issue: 34 Pages: 28785-28794
ACS Applied Materials & Interfaces