Influence of extraction barrier on the loss process of photogenerated charge carrier in polymer bulk heterojunction solar cells

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• 作者：Bo Liu ; Feng Xu ; Xinghua Zhang ; Dadong Yan…
• 关键词：Polymer solar cell ; Master eqution ; Extraction/injection barrier ; Charge collection efficiency
• 刊名：Chemical Research in Chinese Universities
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：31
• 期：5
• 页码：809-813
• 全文大小：518 KB
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• 作者单位：Bo Liu (1)
  Feng Xu (2)
  Xinghua Zhang (3)
  Dadong Yan (4)
  Dan Lu (1)
  
  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
  
• 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：2210-3171

文摘

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. Keywords Polymer solar cell Master eqution Extraction/injection barrier Charge collection efficiency