Solution Processed Organic Transistors on Paper Substrate for Sustainable Electronics

Ecofriendly solution processed organic transistors were demonstrated on a biodegradable paper substrate for −5-V operation. Blend of solution processed organic semiconductor TIPS-pentacene and polystyr- ene (PS) polymer was utilized to form the active layer, along with a natural protein, i.e., gelatin as a primary gate dielectric, both of which offer eco-friendliness from proc- ess and material aspects. Fabricated organic transistors showed excellent transistor behavior for p-channel opera- tion with a maximum process transconductance value of 15 nF/<inline-formula> <tex-math notation="LaTeX">$\text{V}\cdot \text{s}$ </tex-math></inline-formula> leading to the mobility of 2.3 cm2/<inline-formula> <tex-math notation="LaTeX">$\text{V}\cdot \text{s}$ </tex-math></inline-formula> obtained from capacitance density derived at 1 kHz. The average threshold voltage of −0.7 V suitable for low-voltage opera- tion was achieved along with decent ON/OFF current ratio of <inline-formula> <tex-math notation="LaTeX">$\sim 10^{{4}}$ </tex-math></inline-formula>. High electrical stability was demonstrated through repeatability of transfer characteristics and bias-stress measurements. Excellent environmental stability in normal ambient was observed up to seven weeks. These devices showed circuit applicability with decent switching in resis- tive load inverters and good sensitivity to ultraviolet (UV) light, making them a suitable candidate for exploration for multifunctional and disposable application.