Technology Detail

The Office of Technology Licensing was established in 1970 to transfer technologies developed at Stanford. Find out more about OTL's history, mission, staff, and statistics.
Contact | 
Explore Technologies

Stretchable Semiconductor via Polymer Blending

Stanford Reference:



Stanford researchers have created a highly stretchable organic semiconductor by blending high mobility semiconducting polymers with an elastomer. The CONPHINE (conjugated polymer/elastomer phase separation induced elasticity) semiconducting film can be stretched up to 100% strain without affecting mobility, retaining values of 1 cm2 V-1s-1, comparable to that of amorphous silicon. The charge carrier mobility of these durable films are maintained even after 100 times stretching cycles under 100% strain - making CONPHINE films excellent candidates for wearable technology, biocompatible devices, and electronic skins for robotics or prostheses.

3D morphology of the polymer semiconductor - The increased polymer chain dynamics under nanoconfinement reduces the modulus of the conjugated polymer and delays the onset of crack formation under strain, without affecting charge mobility.

Stage of Research
Scientists have fabricated stretchable thin film transistors using the CONPHINE method. The fully stretchable transistors exhibit high stretchability with minimal change in drain current even when poked with a sharp object.

CONPHINE TFT drain current under stretching, twisting, and even poking by a sharp object.
The robust device maintained performance over 1000 repeated stretching cycles to 25% strain at four cycles per second (the general range for applied strains in most wearable electronic applications). Researchers also tested a skin-like finger wearable driver for a light-emitting diode to demonstrate potential use for wearable electronics.


  • Stretchable semiconductor devices for:
    • Wearable and mobile platforms
    • Biocompatible devices and health monitoring
    • Electronic skins for robotics and prostheses


  • Excellent electronic performance under stretching:
    • Charge carrier mobility values same or slightly higher compared to that of a neat conjugated polymer thin film.
    • Durable - At high strains up to 100%, the mobility values of blending films do not decrease and are maintained around 1 cm2 V-1s-1 (3x the neat conjugate polymer and 100% better than any average mobility previously reported for organic semiconductors under high strain).


Related Web Links

Innovators & Portfolio

Patent Status

Date Released

 6/13/2017 12:00

Licensing Contact

Evan Elder, Senior Licensing Associate
650-725-9558 (Mobile)
Request Info

02-139 The Stanford/NASA Vision Chip
03-018 Mesoporous Oxide Film for Improved Oxide/Polymer Interface Adhesion
03-235 Thermal Interface Materials

more technologies »

Related Keywords

PS: thin film: organic transistor   PS: thin film: organic   PS: semiconductor: organic   PS: electronics: flexible   PS: electronics: organic transistor   PS: materials: organic semiconductor   PS: thin film   PS: materials: polymers   PS: sensors: chemical   PS: semiconductor: microcomponents   PS: electronics: skin (e-skin)   MD: orthopedics: prosthetics   PS: sensors: biosensor