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首页> 外文期刊>Advanced energy materials >Quantifying Recombination Losses during Charge Extraction in Bulk Heterojunction Solar Cells Using a Modified Charge Extraction Technique
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Quantifying Recombination Losses during Charge Extraction in Bulk Heterojunction Solar Cells Using a Modified Charge Extraction Technique

机译：使用改进的电荷提取技术量化大体积异质结太阳能电池中电荷提取过程中的重组损失

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摘要

yyA variety of charge extraction (CE) techniques have been developed to measure charge density and recombination coefficients in bulk heterojunction solar cells. Charge recombination during charge extraction as a major limitation of this method has not been systematically quantified. This study reports CE measurements using a newly designed fast switch, which enables the application of a reverse bias to the solar cells facilitating charge extraction. With applied reverse bias, more than 40% increase in the extracted charge is obtained in solar cells with thicker active layers or with fast recombination. The measured charge carrier lifetime increases by up to a factor of three at sufficiently high applied biases (up to 8 V), suggesting significant errors in CE measurements without applied bias. The increased extracted charges with increasing applied bias are attributed to a combination of three cases: (i) slightly faster charge extraction due to the larger electric field; (ii) increased charge extraction rate at high light intensities when the transients are space charge disturbed; (iii) increased charge separated lifetime during charge extraction attributed to the spatial separation of the electron and hole density due to the applied electric field.
机译：yy已开发出多种电荷提取（CE）技术来测量体异质结太阳能电池中的电荷密度和复合系数。电荷提取过程中的电荷重组是该方法的主要局限性，尚未得到系统量化。这项研究报告了使用新设计的快速开关进行的CE测量，该开关可对太阳能电池施加反向偏压，从而促进电荷提取。通过施加反向偏压，在具有较厚的活性层或快速复合的太阳能电池中，提取的电荷增加了40％以上。在足够高的施加偏置电压（最高8 V）下，测得的电荷载流子寿命最多可增加三倍，这表明在没有施加偏置电压的情况下，CE测量存在明显误差。随着施加偏压的增加，提取电荷的增加归因于以下三种情况：（i）由于电场较大，电荷提取略快； （ii）当瞬变受到空间电荷干扰时，在高光强度下提高电荷提取率； （iii）由于施加的电场，由于电子和空穴密度的空间分离，电荷提取期间的电荷分离寿命增加。

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  • 来源
    《Advanced energy materials》 |2017年第11期|1602026.1-1602026.9|共9页
  • 作者

    Wright Brendan; Nakajima Yukihiro; Clarke Tracey M.; Okuda Kouichi; Paananen Heikki; Mozer Attila J.; Mori Shogo;

  • 作者单位

    Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia;

    Shinshu Univ, Fac Text Sci & Technol, Div Chem & Mat, Ueda, Nagano 3868567, Japan;

    Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia|UCL, Dept Chem, London WC1H 0AJ, England;

    Shinshu Univ, Fac Text Sci & Technol, Div Chem & Mat, Ueda, Nagano 3868567, Japan;

    Asamalab, 1-29-8 Nakagomi Saku, Nagano 3850051, Japan;

    Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia;

    Shinshu Univ, Fac Text Sci & Technol, Div Chem & Mat, Ueda, Nagano 3868567, Japan;

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