Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 161, Issue -, Pages 407-415Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2016.12.020
Keywords
Organic photovoltaics; Inverted organic solar cells; Stability and reliability; Shelf lifetime; Outdoor testing; Thermal stability
Funding
- Ministry of New and Renewable Energy (MNRE), Govt. of India
- Department of Electronics and Information Technology, Government of India through the Centre of Excellence for Large Area Flexible Electronics [2(4)/2014-PEGD]
- Department of Science & Technology, Government of India
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Improving the stability and reliability of organic photovoltaic (OPV) devices is an area of intense research as it is the major barrier in the commercialization of these devices. We study the stability of inverted structured OPV devices in the present work. A large number of these were fabricated and their shelf life limes were recorded. P3HT devices show an average T80 (time in which cell efficiency falls to 80% of its initial value) of 34 days. Some of the devices were tested in actual working conditions outdoors in sunlight. A very low T80 value of 12 h was observed during the outdoor testing. Thermal degradation study was performed on the devices at 65 degrees C in dark and an average T80 of 200 h was obtained. Signatures of trap formation were observed by analysing and comparing the dark current-voltage characteristics of the pristine and degraded devices. The solar cells degrade due to trap formation in the active layer and formation of charge extraction barriers at the contacts.
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