Details

Autor(en) / Beteiligte

• Huang, Guangguang
• Wang, Chunlei
• Zhang, Hao
• Xu, Shuhong
• Xu, Qingyu
• Cui, Yiping

Titel

Post-healing of defects: an alternative way for passivation of carbon-based mesoscopic perovskite solar cells via hydrophobic ligand coordinationElectronic supplementary information (ESI) available: Ligand absorption model; digital images and PCE of carbon-based MPSCs; Voc as a function of light intensity; and XPS, TRPL, XRD, AFM and degradation of the perovskite film. See DOI: 10.1039/c7ta09646a

Erscheinungsjahr

2018-02

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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&z.dbd;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. A new and efficient defect post-healing method for carbon-based mesoscopic perovskite solar cells was developed via hydrophobic ligand (TOPO) coordination.