Grain Size Modulation and Interfacial Engineering of CH3NH3PbBr3 Emitter Films through Incorporation of Tetraethylammonium Bromide. Issue 9 (27th February 2018)

• Record Type: Journal Article
• Authors: Jamaludin, Nur Fadilah; Yantara, Natalia; Ng, Yan Fong; Li, Mingjie; Goh, Teck Wee; Thirumal, Krishnamoorthy; Sum, Tze Chien; Mathews, Nripan; Soci, Cesare; Mhaisalkar, Subodh
• Is Part Of: Chemphyschem. Volume 19:Issue 9(2018)
• Page Start: 1075
• Page End: 1080
• Publication Date: 2018-02-27
• Subjects: CH3NH3PbBr3 -- hybrid halide perovskites -- light-emitting diodes -- mixed dimensional systems -- postdeposition treatment; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201701380
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Metal halide perovskites have demonstrated breakthrough performances as absorber and emitter materials for photovoltaic and display applications respectively. However, despite the low manufacturing cost associated with solution‐based processing, the propensity for defect formation with this technique has led to an increasing need for defect passivation. Here, we present an inexpensive and facile method to remedy surface defects through a postdeposition treatment process using branched alkylammonium cation species. The simultaneous realignment of interfacial energy levels upon incorporation of tetraethylammonium bromide onto the surface of CH3 NH3 PbBr3 films contributes favorably toward the enhancement in overall light‐emitting diode characteristics, achieving maximum luminance, current efficiency, and external quantum efficiency values of 11 000 cd m −2, 0.68 cd A −1, and 0.16 %, respectively. Abstract : Morphological tuning and defect management : Surface post‐treatment of CH3 NH3 PbBr3 with a large branched alkyl molecule (tetraethylammonium bromide) offers a facile remedy for film defects, as reflected by a more balanced surface elemental stoichiometry. Substantiated with remarkable enhancement in LED device performance, this work reveals the vital importance of perovskite film passivation.