Post-healing of defects: an alternative way for passivation of carbon-based mesoscopic perovskite solar cells via hydrophobic ligand coordination. Issue 6 (22nd January 2018)

• Record Type: Journal Article
• Authors: Huang, Guangguang; Wang, Chunlei; Zhang, Hao; Xu, Shuhong; Xu, Qingyu; Cui, Yiping
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 6(2018)
• Page Start: 2449
• Page End: 2455
• Publication Date: 2018-01-22
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta09646a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A new and efficient defect post-healing method for carbon-based mesoscopic perovskite solar cells was developed via hydrophobic ligand (TOPO) coordination. Abstract : The passivation of defects at perovskite grain boundaries (GB) is crucial in achieving highly efficient and stable perovskite solar cells. Unlike the widely used additive passivation method where a mixture of additives and perovskite precursor is used for preparing perovskite films, we herein developed a new defect post-healing method via dip-coating trioctylphosphine oxide (TOPO) ligands on pre-fabricated carbon-based mesoscopic perovskite solar cells (MPSCs). Since perovskites have formed before post-healing, TOPO ligands are selectively adsorbed onto the exposed perovskite surface and hence have little influence on charge extraction of interfaces. The defects are post-healed via O atoms in PO bonds coordinated to halide-deficient sites, leading to an enhancement of the power conversion efficiency (PCE) from 11.0% to 12.8%. Moreover, due to the three hydrophobic long chain alkyls in TOPO, the humidity stability of the device has also been improved simultaneously.