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IJPAP Vol.46(08) [August 2008] >


Title: Role of binding energy in the generation of photocurrent in bulk heterojunction organic materials
Authors: Sharma, S K
Bothra, Chandra
Sharma, G D
Keywords: Bulk hetereojunction
Binding energy
Photocurrent density
Polymer
Fullerene interface
Issue Date: Aug-2008
Publisher: CSIR
Abstract: The role of binding energy of electron hole pair in the generation of photocurrent has been studied using Braun’s model based on Onsager theory. For the study, two bulk heterojunction devices namely poly (2-methoxy-5-(3′,7′- dimethyloctyloxy)-p-phenylene vinylene)(OC₁C₁₀-PPV) and poly (2-methoxy-5-(3′, 7′-dimethyloctyloxy)-1-4-phenylene vinylene) (MDMO-PPV) have been chosen. These materials act as electron donor in the bulk hetero-junctions and are based on intermixing of conjugate polymers and fullerene derivatives. Photocurrent has been calculated theoretically for different values of exciton binding energies. The variation of photocurrent with binding energy shows that a constant value of photocurrent is obtained up to a threshold value of 0.6 eV. When binding energy exceeds the threshold value, photocurrent diminishes rapidly. Thus, binding energy plays an important role in the generation of photocurrent and can be used as a primary parameter for the characterization of organic semiconductors in solar cell applications.
Page(s): 588-592
ISSN: 0019-5596
Source:IJPAP Vol.46(08) [August 2008]

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