Understanding degradation phenomena in organic electronic devices

Jagdish A.K.; G. Pavan Kumar; Praveen C. Ramamurthy; D. Roy Mahapatra; Gopalkrishna Hegde

doi:10.1117/12.2082576

16 March 2015 Understanding degradation phenomena in organic electronic devices

Jagdish A.K., G. Pavan Kumar, Praveen C. Ramamurthy, D. Roy Mahapatra, Gopalkrishna Hegde

Proceedings Volume 9360, Organic Photonic Materials and Devices XVII; 93600S (2015) https://doi.org/10.1117/12.2082576
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

This study addresses a unique degradation mechanism in organic electronic devices occurring due to combined effects of electric field and temperature. A simple polymer diode structure consisting of a semiconducting polymer sandwiched between two electrodes (ITO and Al) is considered for degradation studies. It is observed that voltages beyond a certain value lead to fracture of polymer and aluminium films. As characterized, these defects show that the degradation nucleates in the form of a chain-like pattern consisting of alternating polymer fracture sites (hinges) and aluminium rupture sites (links). A mechanism is hypothesized based on experimental observations to explain the phenomenon. This is further validated by an analytical model for stress at degradation sites due to electric field and temperature. The model is used to develop a failure criteria based on device geometry, operating voltage and temperature. Experiments and modelling predict that this mechanism might be unique to soft thin film electronic devices.

Citation Download Citation

Jagdish A.K., G. Pavan Kumar, Praveen C. Ramamurthy, D. Roy Mahapatra, and Gopalkrishna Hegde "Understanding degradation phenomena in organic electronic devices", Proc. SPIE 9360, Organic Photonic Materials and Devices XVII, 93600S (16 March 2015); https://doi.org/10.1117/12.2082576

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