Synergistic optimization of interfacial energy-level alignment and defect passivation toward efficient annealing-free inverted polymer solar cells,Journal of Materials Chemistry A

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Synergistic optimization of interfacial energy-level alignment and defect passivation toward efficient annealing-free inverted polymer solar cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-11 , DOI: 10.1039/d0ta05696k
Shuai Huang _{1,

2,

3,

4,

5} , Lian Duan _{1,

2,

3,

4,

5} , Dongdong Zhang _{1,

2,

3,

4,

5}

Affiliation

A highly efficient inverted polymer solar cell (PSC) has been demonstrated by incorporating an insulating inorganic cerium fluoride (CeF₃) layer between the annealing-free zinc oxide (ZnO) electron transport layer (ETL) and the photoactive layer. The CeF₃-embedded solar cell fabricated by a full annealing-free process presents an overwhelming power conversion efficiency (PCE) of up to 10.53% for the PTB7-Th:PC₇₁BM-based blend system, which far surpasses that of the reference device with a bare ZnO interlayer (8.48%). Ultraviolet photoelectron spectroscopy revealed that the interfacial energy level alignment has been intentionally improved by forming an interfacial dipole layer at the interface between the ZnO ETL and the ultrathin CeF₃ interlayer, leading to a reduced energy barrier for electron transport as well as depressed photogenerated carrier recombination. Concurrently, the addition of CeF₃ also passivates the interfacial defect states of the ZnO film and ameliorates the inherent incompatibility with the hydrophobic photoactive layer. This protocol demonstrates that the utilization of the ZnO/CeF₃ multifunctional interlayer affords a facile but effective strategy for achieving high-performance inverted PSCs, which does not require postprocessing thermal annealing treatments, laying a good foundation for the future developments of organic photovoltaic devices.

中文翻译：

高效能的无退火倒置聚合物太阳能电池的界面能级对准和缺陷钝化的协同优化

通过在无退火氧化锌（ZnO）电子传输层（ETL）和光敏层之间掺入绝缘无机氟化铈（CeF ₃）层，已证明了高效的倒置聚合物太阳能电池（PSC）。通过完全无退火工艺制造的嵌入CeF ₃的太阳能电池在基于PTB7-Th：PC ₇₁ BM的混合系统中表现出高达10.53％的压倒性功率转换效率（PCE），远远超过了参考文献带有裸露的ZnO中间层的器件（8.48％）。紫外光电子能谱显示，通过在ZnO ETL和超薄CeF ₃之间的界面上形成界面偶极层，有意地改善了界面能级排列中间层，导致电子传输的能垒降低，以及光生载流子重组降低。同时，CeF _3的添加还钝化了ZnO膜的界面缺陷状态，并改善了与疏水性光敏层的固有不相容性。该协议表明，ZnO / CeF ₃多功能中间层的利用为实现高性能倒装PSC提供了一种简便而有效的策略，而无需进行后热处理退火，这为有机光伏器件的未来发展奠定了良好的基础。

更新日期：2020-09-22

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