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Physicochemical Studies on Nafion® Modified ZnO Interlayers for Enhanced Electron Transport in the Inverted Polymer Solar Cells
ChemistrySelect ( IF 2.1 ) Pub Date : 2018-09-17 , DOI: 10.1002/slct.201801845
R. Remya 1, 2 , P. T. G. Gayathri 1, 2 , K. N. N. Unni 1, 2 , Biswapriya Deb 1, 2
Affiliation  

Electron selective intermediate layers are crucial for both efficiency and stability of the inverted polymer solar cells (I‐PSCs). In this paper, an established low‐temperature (<130 °C) recipe to fabricate nano zinc oxide (ZnO) layers (L‐ZnO) exhibited typical values of power conversion efficiency (PCE∼3.3%) with the standard P3HT:PC61BM blend. However, PCEs showed further improvement up to ∼24% (∼ 4.08%) when these layers were annealed at 300 °C (H‐ZnO). This annealing step can be bypassed by adopting a slightly different chemistry using Nafion as a modifier (NM‐ZnO). I‐PSCs fabricated with NM‐ZnO showed nearly 40% increase in the PCE (∼4.62%) with PEDOT:PSS hole transport layers (HTL) that matches the so far highest recorded value for such a system. For the low‐bandgap polymer blend PBDTT‐FTTE:PC71BM, a peak efficiency of ∼6.77% was obtained compared to ∼5.34% with L‐ZnO (∼28% increase). Our experiments revealed that these enhancements were due to a combination of benefits obtained from Nafion modification such as favourable positioning of work function (WF), high band gap (Eg) and better transport characteristics through the layer interfaces.

中文翻译:

Nafion®修饰的ZnO中间层用于增强聚合物在反向聚合物太阳能电池中的电子传输的物理化学研究

电子选择性中间层对于倒置聚合物太阳能电池(I-PSC)的效率和稳定性至关重要。在本文中,已建立的用于制造纳米氧化锌(ZnO)层(L‐ZnO)的低温(<130°C)配方在标准P3HT:PC 61下表现出典型的功率转换效率值(PCE〜3.3%)BM混合。但是,当这些层在300°C(H-ZnO)退火时,PCE表现出进一步的改善,达到了约24%(约4.08%)。使用Nafion作为改性剂(NM-ZnO),可以采用略有不同的化学方法来绕过该退火步骤。用NM-ZnO制成的I-PSC在PEDOT:PSS空穴传输层(HTL)的PCE方面增长了近40%(约4.62%),与迄今为止该系统的最高记录值相匹配。对于低带隙聚合物共混物PBDTT-FTTE:PC71 BM时,峰值效率约为6.77%,而L-ZnO约为5.34%(提高了28%)。我们的实验表明,这些增强是由于从Nafion修饰中获得的好处的组合,例如有利的功函(WF)定位,高带隙(Eg)和更好的穿过层界面的传输特性。
更新日期:2018-09-17
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