shuhui

Organic-inorganic mixed perovskite solar cells demonstrate superiority for the application as low-cost printable solar energy, yet common processing of solvent-controlled crystallization routes contain highly toxic solvents that cause safety and/or environmental issues. In article number 1700576, Fuzhi Huang, Jie Zhong, and co-workers demonstrate a green solvent engineering incorporated interface optimization method to address this topic, and high performance devices are obtained.

Herein, this study reports high-efficiency, low-temperature ZnO based planar perovskite solar cells (PSCs) with state-of-the-art performance. They are achieved via a strategy that combines dual-functional self-assembled monolayer (SAM) modification of ZnO electron accepting layers (EALs) with sequential deposition of perovskite active layers. The SAMs, constructed from newly synthesized molecules with high dipole moments, act both as excellent surface wetting control layers and as electric dipole layers for ZnO-EALs. The insertion of SAMs improves the quality of PbI₂ layers and final perovskite layers during sequential deposition, while charge extraction is enhanced via electric dipole effects. Leveraged by SAM modification, our low-temperature ZnO based PSCs achieve an unprecedentedly high power conversion efficiency of 18.82% with a V_OC of 1.13 V, a J_SC of 21.72 mA cm⁻², and a FF of 0.76. The strategy used in this study can be further developed to produce additional performance enhancements or fabrication temperature reductions.

Low-temperature planar perovskite solar cells with efficiency of 18.82% are developed via a strategy that combines dual-functional self-assembled monolayer (SAM) modification of ZnO electron accepting layers with sequential deposition of perovskite active layers. The SAMs, constructed from newly synthesized molecules with high dipole moments, act both as excellent surface wetting control layers and as electric dipole layers for ZnO layers.

In article number 1700722, Aleksandra B. Djurišić, Zhu-Bing He, and co-workers investigate the cesium doped NiO film as highly transparent and conductive HTL for inverted perovskite solar cells. Cs dopant can significantly improve the conductivity of NiO and lower the work function, allowing better charge transfer and band alignment between perovskite and Cs doped NiO. Efficiency over 19% for the Cs doped devices is obtained and 90% of its initial performance is maintained after 80 days.