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|Title:||Role of binding energy in the generation of photocurrent in bulk heterojunction organic materials|
|Authors:||Sharma, S K|
Sharma, G D
|Keywords:||Bulk hetereojunction;Binding energy;Photocurrent density;Polymer;Fullerene interface|
|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.|
|Appears in Collections:||IJPAP Vol.46(08) [August 2008]|
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