Free carrier generation and recombination in PbS quantum dot solar cells
Free carrier generation and recombination in PbS quantum dot solar cells
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DOI：
10.1063/1.4943379
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发表时间：
2016-03-07
影响因子：
4
通讯作者：
Neher, Dieter
中科院分区：
文献类型：
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作者：
Kurpiers, Jona;Balazs, Daniel M.;Neher, Dieter
利用延时收集场和偏压辅助电荷提取（BACE）实验研究了PbS胶体量子点太阳能电池中载流子的动力学行为。我们发现，自由载流子的创建是轻微的字段依赖，从而提供了一个上限的填充因子。BACE测量揭示了相当高的有效迁移率2 × 10（-3）cm（2）/Vs，这意味着电荷提取是有效的。另一方面，测得了相当高的稳态非成对复合系数，为3 × 10 ~（-10）cm ~（3）/s。因此，我们提出了一个快速的自由电荷复合构成的PbS胶体量子点电池的效率有限的主要来源。(C)2016 AIP Publishing LLC.
Time Delayed Collection Field and Bias Assisted Charge Extraction (BACE) experiments are used to investigate the charge carrier dynamics in PbS colloidal quantum dot solar cells. We find that the free charge carrier creation is slightly field dependent, thus providing an upper limit to the fill factor. The BACE measurements reveal a rather high effective mobility of 2 x 10(-3) cm(2)/Vs, meaning that charge extraction is efficient. On the other hand, a rather high steady state non-geminate recombination coefficient of 3 x 10(-10) cm(3)/s is measured. We, therefore, propose a rapid free charge recombination to constitute the main origin for the limited efficiency of the PbS colloidal quantum dots cells. (C) 2016 AIP Publishing LLC.