Journal
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 31, Issue 5, Pages 809-813Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-015-5102-6
Keywords
Polymer solar cell; Master eqution; Extraction/injection barrier; Charge collection efficiency
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Funding
- National Natural Science Foundation of China [21174049, 91333103]
- State Key Laboratory of Supramolecular Structure and Materials, China [201329]
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Based on a full device model adopting three-dimensional Pauli master equation approach, the charge carrier loss process due to poor extraction channels between electrode and active layer in polymer bulk heterojunction(BHJ) solar cells was studied. The influence of barrier height on device performance was simulated to reveal the importance of electrode improvement. It was found that relatively large extraction barrier height(over 0.40 eV) can lead to the significant diminishing of the overall charge collection efficiency, since bimolecular recombination rate would increase to a high level due to enhanced space charge accumulation effect near electrodes. In contrast, the percentage of charge carrier annihilated due to geminate recombination did not change significantly with barrier height variation. Our simulation results may provide the basis for a more accurate model and potential direction of polymer BHJ solar cells improvement.
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