Blade‐Coated Carbon Electrode Perovskite Solar Cells to Exceed 20% Efficiency Through Protective Buffer Layers

• DOI: 10.1002/adfm.202301920
• Publication Date: 2023-05-02T04:12:58Z
• Authors: Yaqing Li; Xiayao Lu; Yantao Mei; Chen Dong; Deepak Thrithamar...; Kong Liu; Zhijie Wang; Shengchun Qu; Makhsud I. Saidam...; Weifeng Zhang; Furui Tan
• Keywords: Ohmic contact

Abstract Perovskite solar cells with carbon electrode have a commercial impact because of their facile scalability, low‐cost, and stability. In these devices, it remains challenge to design an efficient hole transport layer (HTL) for robust interfacing perovskite on one side another. Herein, organic/inorganic double planar HTL is constructed based polythiophene (P3HT) nickel oxide (NiOx) nanoparticles address the named challenge. Through adding alkyl ammonium bromide (CTAB) modified NiOx nanoparticle P3HT, achieves cascade type‐II energy level alignment at perovskite/HTL interfaces preferential ohmic contact NiOx/carbon electrode, which greatly benefits in charge collection while suppressing transfer recombination. Besides, compared single P3HT layer, composite enables interfacial by protecting from being corroded paste during fabrication. As result, blade‐coated FA 0.6 MA 0.4 PbI 3 (fabricated ambient air fume hood) deliver efficiency 20.14%, highest value bladed coated cells, withstand 275 h maximum power point tracking without encapsulation (95% retained).