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Thousand‐fold Conductivity Increase in 2D Perovskites by Polydiacetylene Incorporation and Doping
Author(s) -
OrtizCervantes Carmen,
RománRomán Priscila I.,
VazquezChavez Josué,
HernándezRodríguez Marcos,
SolisIbarra Diego
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201809028
Subject(s) - perovskite (structure) , halide , polydiacetylenes , doping , conductivity , materials science , absorption (acoustics) , iodide , thermal stability , band gap , electrical resistivity and conductivity , chemistry , conjugated system , chemical physics , inorganic chemistry , optoelectronics , crystallography , polymer , organic chemistry , composite material , engineering , electrical engineering
Two‐dimensional (2D) organic–inorganic perovskites have rapidly become an attractive alternative to traditional three‐dimensional (3D) perovskite solar‐cell absorbers owing to their improved stability and processability. Despite their advantages, the insulating nature of the organic cations and diminished light absorption limit their overall performance. Herein, it is demonstrated that the incorporation of conjugated diynes in hybrid 2D perovskites, and subsequent thermal treatment results in the formation of 2D perovskites that incorporate polydiacetylenes in their structure. Furthermore, it is shown that oxygen or iodine doping results in the formation of stable radicals within the material alongside a drastic shift of the band gap from 3.0 to 1.4 eV and in‐plane conductivity improvements of up to three orders of magnitude, which lead to record conductivities for 2D halide perovskites ( n =1).