Cubic: Column composite structure (NH2CH=NH2)x(CH3NH3)1-xPbI3 for efficient hole-transport material-free and insulation layer free perovskite solar cells with high stability. (1st February 2016)

• Record Type: Journal Article
• Authors: Bai, Sihang; Cheng, Nian; Yu, Zhenhua; Liu, Pei; Wang, Changlei; Zhao, Xing-Zhong
• Is Part Of: Electrochimica acta. Volume 190(2016)
• Page Start: 775
• Page End: 779
• Publication Date: 2016-02-01
• Subjects: Hole-Transport Material-Free -- insulation layer free -- perovskite solar cell -- cubic: column composite structure -- mixed-organic-cation; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.12.170
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: We have designed a novel hole-conductor-free and insulation layer free mesoscopic perovskite solar cells (PSCs) with a low cost carbon counter electrode (CE). Significantly, to enhance solar light harvesting capability, a mixture of methylammonium (CH3 NH3 +, MA) and formamidinium (HNCHNH3 +, FA) cations were explored to synthesize superior performance perovskite materials. With the introduction of FAI, Cubic: Column composite structure of (FA)x (MA)1-x PbI3 was formed on the top of mesoscopic TiO2 . This nanostructure not only leads to fully coverage of perovskite on TiO2 but also provides salutary electron transport channels to effectively reduce the electron recombination probability. As a result, optimal solar cell efficiency of 13.03% of (FA)x (MA)1-x PbI3 composite structure based PSC (when x is fixed at 0.25) was achieved, while PSC based typical MAPbI3 cuboids only obtained an efficiency of 12.49%. Despite of the improved efficiency, the Cubic: Column composite structure caused by the addition of FAI also contributes to higher long-term and thermal stability.