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Enhancement of open-circuit voltage and the fill factor in CdTe nanocrystal solar cells by using interface materials

机译：通过使用界面材料提高CdTe纳米晶体太阳能电池的开路电压和填充因子

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摘要

Interface states influence the operation of nanocrystal (NC) solar cell carrier transport, recombination and energetic mechanisms. In a typical CdTe NC solar cell with a normal structure of a ITO/p-CdTe NCs-acceptor (or without)/Al configuration, the contact between the ITO and CdTe is a non-ohm contact due to a different work function (for an ITO, the value is ~4.7 eV, while for CdTe NCs, the value is ~5.3 eV), which results in an energetic barrier at the ITO/CdTe interface and decreases the performance of the NC solar cells. This work investigates how interface materials (including Au, MoO_x and C_(60)) affect the performance of NC solar cells. It is found that devices with interface materials have shown higher V_(oc) than those without interface materials. For the case in which we used Au as an interface, we obtained a high opencircuit voltage of 0.65 V, coupled with a high fill factor (62%); this resulted in a higher energy conversion efficiency (ECE) of 5.3%, which showed a 30% increase in the ECE compared with those without the interlayer. The capacitance measurements indicate that the increased V_(oc) in the case in which Au was used as the interface is likely due to good ohm contact between the Au's and the CdTe NCs' thin film, which decreases the energetic barrier at the ITO/CdTe interface.
机译：界面状态影响纳米晶体（NC）太阳能电池载流子传输，重组和高能机理的运行。在具有ITO / p-CdTe NCs / n受体（或不包含）/ Al构型的正常结构的典型CdTe NC太阳能电池中，由于功函数不同，ITO和CdTe之间的接触是非欧姆接触（对于ITO，该值为〜4.7 eV，而对于CdTe NCs，该值为〜5.3 eV），这会导致ITO / CdTe界面处的能量屏障，并降低NC太阳能电池的性能。这项工作研究界面材料（包括Au，MoO_x和C_（60））如何影响NC太阳能电池的性能。发现具有界面材料的器件显示出比没有界面材料的器件更高的V_（oc）。对于我们使用Au作为界面的情况，我们获得了0.65 V的高开路电压，以及高的填充系数（62％）;这导致了5.3％的更高的能量转换效率（ECE），与没有中间层的能量转换效率相比，ECE增长了30％。电容测量结果表明，在使用Au作为界面的情况下，V_（oc）的增加可能是由于Au与CdTe NCs薄膜之间的良好欧姆接触，从而降低了ITO / CdTe的能垒。接口。

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