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Scalable PbS Quantum Dot Solar Cell Production by Blade Coating from Stable Inks
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-20 , DOI: 10.1021/acsami.0c18204
Nataliia Sukharevska 1 , Dmytro Bederak 1 , Vincent M Goossens 1 , Jamo Momand 1 , Herman Duim 1 , Dmitry N Dirin 2, 3 , Maksym V Kovalenko 2, 3 , Bart J Kooi 1 , Maria A Loi 1
Affiliation  

The recent development of phase transfer ligand exchange methods for PbS quantum dots (QD) has enhanced the performance of quantum dots solar cells and greatly simplified the complexity of film deposition. However, the dispersions of PbS QDs (inks) used for film fabrication often suffer from colloidal instability, which hinders large-scale solar cell production. In addition, the wasteful spin-coating method is still the main technique for the deposition of QD layer in solar cells. Here, we report a strategy for scalable solar cell fabrication from highly stable PbS QD inks. By dispersing PbS QDs capped with CH3NH3PbI3 in 2,6-difluoropyridine (DFP), we obtained inks that are colloidally stable for more than 3 months. Furthermore, we demonstrated that DFP yields stable dispersions even of large diameter PbS QDs, which are of great practical relevance owing to the extended coverage of the near-infrared region. The optimization of blade-coating deposition of DFP-based inks enabled the fabrication of PbS QD solar cells with power conversion efficiencies of up to 8.7%. It is important to underline that this performance is commensurate with the devices made by spin coating of inks with the same ligands. A good shelf life-time of these inks manifests itself in the comparatively high photovoltaic efficiency of 5.8% obtained with inks stored for more than 120 days.

中文翻译:


通过稳定油墨刮刀涂布生产可扩展的 PbS 量子点太阳能电池



最近发展的PbS量子点(QD)相转移配体交换方法提高了量子点太阳能电池的性能,并大大简化了薄膜沉积的复杂性。然而,用于薄膜制造的 PbS QD(油墨)分散体常常存在胶体不稳定的问题,这阻碍了太阳能电池的大规模生产。此外,浪费的旋涂法仍然是太阳能电池中QD层沉积的主要技术。在这里,我们报告了一种利用高度稳定的 PbS QD 墨水制造可扩展太阳能电池的策略。通过将CH 3 NH 3 PbI 3封端的PbS QD分散在2,6-二氟吡啶(DFP)中,我们获得了胶体稳定性超过3个月的油墨。此外,我们证明即使是大直径 PbS 量子点,DFP 也能产生稳定的色散,由于近红外区域的覆盖范围扩大,因此具有很大的实际意义。基于 DFP 的油墨的刮刀涂层沉积的优化使得 PbS QD 太阳能电池的制造能够实现高达 8.7% 的功率转换效率。需要强调的是,这种性能与通过旋涂具有相同配体的墨水制成的器件相当。这些墨水的良好保质期体现在墨水储存超过 120 天时获得的相对较高的光伏效率为 5.8%。
更新日期:2021-02-03
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