Royal Society of Chemistry, Chemical Science, 35(10), p. 8187-8194, 2019
DOI: 10.1039/c9sc03378e
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We identify the existence of nonlinear optical (NLO) activity in a number of novel ABX3-type metal-free perovskites, where A is a highly tuneable organic cation, B is a NH4 cation and X is a halide anion.