Thermal annealing study on P3HT: PCBM based bulk heterojunction organic solar cells using impedance spectroscopy

Journal Article · Wed Oct 15 04:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4898233· OSTI ID:22308004

Sharma, Ramakant; G, Srinivas; Gupta, Dipti ^[1]

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1. Plastic Electronics and Energy Lab (PEEL) Department of Metallurgical Engineering and Material Science, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India)

Recently, Thermal annealing is an important process for bulk heterojunction organic solar cells (BHJ OSCs) to improve the device efficiency and performance of the organic solar cells. Here in, we have examined the changes in the efficiency and morphology of P3HT: PCBM film according to the thermal annealing temperature to find the changes during the annealing process by measuring the optical absorption, atomic force microscope and X-ray diffraction. We also investigated the effect of different annealing process conditions (without, pre- and post-annealing) on the device performance of the inverted bulk heterojunction organic solar cells consist the structure of ITO/ ZnO / P3HT: PCBM / MoO{sub 3}/ Al by measuring AC impedance characteristics. Particularly, the power conversion efficiency (PCE), crystalline nature of the polymer, light absorption and the surface smoothness of P3HT: PCBM films are significantly improved after the annealing process. These results indicated the improvement in terms of PCE, interface smoothness between the P3HT: PCBM and MoO{sub 3} layers of the post annealed device originated from the decrease of series resistance between P3HT: PCBM layer and Al electrodes, which could be due to decrease in the effective life time of charge carriers.

• OSTI ID: 22308004
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1620; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ANNEALING
ATOMIC FORCE MICROSCOPY
CHARGE CARRIERS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ENERGY EFFICIENCY
HETEROJUNCTIONS
IMPEDANCE
INTERFACES
LAYERS
MOLYBDENUM OXIDES
MORPHOLOGY
ORGANIC POLYMERS
ORGANIC SOLAR CELLS
PHOTOVOLTAIC CONVERSION
ROUGHNESS
VISIBLE RADIATION
X-RAY DIFFRACTION
ZINC OXIDES