Rational Core–Shell Design of Open Air Low Temperature In Situ Processable CsPbI3 Quasi‐Nanocrystals for Stabilized p‐i‐n Solar Cells. Issue 31 (8th July 2019)

• Record Type: Journal Article
• Authors: Xi, Jun; Piao, Chengcheng; Byeon, Junseop; Yoon, Jungjin; Wu, Zhaoxin; Choi, Mansoo
• Is Part Of: Advanced energy materials. Volume 9:Issue 31(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-08
• Subjects: core–shell design -- CsPbI3 quasi‐nanocrystals -- in situ process -- low temperature -- p‐i‐n solar cells; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201901787
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: As a promising alternative, inorganic perovskite nanocrystals allow reinforced stability of photovoltaic device. Unfortunately, directly assembling these nanocrystals into film is uncontrollable. Instead, in situ assembling technology under low temperature in open air is attractive but limited due to the tendency of nonperovskite transition. The adverse shell ligands and unstable core lattices are known as the fundamental problems. In order to address this issue, here proposed is a rational core–shell design: 1) with respect to ligands, a new one, 4‐fluorophenethylammonium iodide, is used to enhance bonding force and charge coupling between ligands and nanocrystals; 2) with respect to lattices, a novel compound H2 PbI4 is employed to assist divalent ion (Mn 2+ ) doping into perovskite lattices. By low temperature in situ processing CsPbI3 quasi‐nanocrystal film, the highest power conversion efficiency of 13.4% for p‐i‐n solar cells is achieved, which retains 92% after 500 h in ambient air. The current study underlines the significance of rational hierarchical design of inorganic perovskite nanocrystals, especially for low temperature in situ processable electronic devices. Abstract : A rational core–shell design of open air low temperature in situ processable CsPbI3 quasi‐nanocrystals is proposed. A bifunctional ligand 4‐fluorophenethylammonium iodide and new compound H2 PbI4 increase crystal stability, charge extraction, and assist divalent ion doping, respectively. The best p‐i‐n solar cell with 13.4% efficiency can retain 72% beyond 500 h in ambient air without encapsulation.