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首页> 外文期刊>Advanced Functional Materials >Monolayer Hexagonal Boron Nitride: An Efficient Electron Blocking Layer in Organic Photovoltaics
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Monolayer Hexagonal Boron Nitride: An Efficient Electron Blocking Layer in Organic Photovoltaics

机译：单层六边形氮化物：有机光伏中的有效电子阻挡层

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摘要

In this study, monolayer hexagonal boron nitride (h-BN) grown via chemical vapor deposition (CVD) as an effective electron blocking layer (EBL) for the organic photovoltaics (OPVs) is proposed. Unexpectedly, it is found that h-BN can replace the commonly used hole transport layers (HTLs), i.e., molybdenum trioxide (MoO3) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) in an inverted device architecture. Here, a wet-transfer technique is employed and a single layer of h-BN on top of the PV2000:PC60BM blend is successfully placed. Analysis of the bandgap diagram shows that the monolayer h-BN makes smaller barrier for holes but significantly larger barrier for electrons. This makes the h-BN effective in blocking electrons while creating a possible path for the holes through tunneling to the electrode, due to the low energy barrier at the PV2000/h-BN interface. Using h-BN as an EBL, efficient inverted OPVs are achieved with an average solar-to-power conversion efficiency of 6.13%, which is comparable with that of reference devices based on MoO3 (7.3%) and PEDOT:PSS (7.6%) as HTLs. Interestingly, the devices with h-BN shows great light-soak stability. The study reveals that the monolayer h-BN grown by CVD could be an effective alternative EBL for the fabrication of efficient, lightweight, and stable OPVs.
机译：在本研究中，提出了通过化学气相沉积（CVD）生长作为有机光伏（OPV）的有效电子阻挡层（EBL）生长的单层六边形氮化硼（H-BN）。出乎意料地，发现H-BN可以在倒装置架构中取代常用的空穴传输层（HTL），即三氧化钼（MOO3）和聚（3,4-亚乙基氧基噻吩）聚苯乙烯磺酸（PEDOT：PSS）。这里，采用湿转移技术，并在PV2000顶部的单层H-BN成功地放置了PC60BM共混物。该带隙图的分析表明，单层H-BN为孔制造较小的屏障，但是电子对电子的屏障显着更大。这使得H-BN在阻挡电子时有效地阻挡电子，同时通过PV2000 / H-BN接口处的低能量屏障产生通过隧穿到电极的可能路径。使用H-BN作为EBL，实现高效的倒置OPV，平均太阳能电力转换效率为6.13％，这与基于Moo3（7.3％）和PEDOT的参考装置（7.6％）相当作为htls。有趣的是，具有H-BN的器件显示出很大的光浸泡稳定性。该研究表明，CVD种植的单层H-BN可以是用于制造有效，轻质和稳定的OPV的有效替代EBL。

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