Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells

doi:10.1007/s40242-015-5102-6

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (5): 809-813.doi: 10.1007/s40242-015-5102-6

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Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells

LIU Bo¹, XU Feng², ZHANG Xinghua³, YAN Dadong⁴, LU Dan¹

1. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
2. Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China;
3. School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China;
4. Department of Physics, Beijing Normal University, Beijing 100875, P. R. China

Received:2015-03-16 Revised:2015-06-23 Online:2015-10-01 Published:2015-10-10
Contact: YAN Dadong, E-mail: yandd@bnu.edu.cn; LU Dan, E-mail: lud@jlu.edu.cn E-mail:yandd@bnu.edu.cn;lud@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21174049, 91333103) and the Open Project of State Key Laboratory of Supramolecular Structure and Materials, China(No.201329).

Abstract

Abstract:

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.

Key words: Polymer solar cell, Master eqution, Extraction/injection barrier, Charge collection efficiency

LIU Bo, XU Feng, ZHANG Xinghua, YAN Dadong, LU Dan. Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells[J]. Chemical Research in Chinese Universities, 2015, 31(5): 809-813.

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Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells

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