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Boosting perovskite nanomorphology and charge transport properties via a functional D-π-A organic layer at the absorber/hole transporter interface.
Nanoscale ( IF 6.7 ) Pub Date : 2020-06-17 , DOI: 10.1039/d0nr02562c
Mohamed M Elsenety 1 , Anastasios Stergiou 2 , Labrini Sygellou 3 , Nikos Tagmatarchis 2 , Nikolaos Balis 1 , Polycarpos Falaras 1
Affiliation  

The photovoltaic efficiency and stability challenges encountered in perovskite solar cells (PSCs) were addressed by an innovative interface engineering approach involving the utilization of the organic chromophore (E)-3-(5-(4-(bis(2′,4′-dibutoxy-[1,1′-biphenyl]-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid (D35) as an interlayer between the perovskite absorber and the hole transporter (HTM) of mesoporous PSCs. The organic D–π-A interlayer primarily improves the perovskite's crystallinity and creates a smoother perovskite/HTM interface, while reducing the grain boundary defects and inducing an energy level alignment with the adjacent layers. Champion power conversion efficiencies (PCE) as high as 18.5% were obtained, clearly outperforming the reference devices. Interestingly, the D35-based solar cells present superior stability since they preserved 83% of their initial efficiency after 37 days of storage under dark and open circuit (OC) conditions. The obtained results consolidate the multifunctional role of organic D–π-A molecules as perovskite interface modifiers towards performance enhancement and scale-up fabrication of robust PSCs.

中文翻译:

通过吸收体/空穴传输层界面处的功能性D-π-A有机层增强钙钛矿的纳米形态和电荷传输性能。

钙钛矿太阳能电池(PSC)遇到的光伏效率和稳定性挑战通过涉及有机发色团(E)-3-(5-(4-(双(2',4'-二丁氧基-[1,1'-联苯] -4-基)氨基)苯基)噻吩-2-基)-2-氰基丙烯酸( D35)作为钙钛矿吸收剂和介孔PSC的空穴传输剂(HTM)之间的中间层。有机D–π-A中间层主要改善钙钛矿的结晶度并创建更平滑的钙钛矿/ HTM界面,同时减少晶界缺陷并引起与相邻层的能级对齐。获得的冠军功率转换效率(PCE)高达18.5%,明显优于参考器件。有趣的是,基于D35的太阳能电池具有出色的稳定性,因为它们在黑暗和开路(OC)条件下存储37天后仍能保持其初始效率的83%。
更新日期:2020-07-23
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