Tunable exciton binding energy in 2D hybrid layered perovskites through donor–acceptor interactions within the organic layer

James V. Passarelli, Catherine M. Mauck, Samuel W. Winslow, Collin F. Perkinson, Jacob C. Bard, Hiroaki Sai, Kristopher W. Williams, Ashwin Narayanan, Daniel J. Fairfield, Mark P. Hendricks, William A. Tisdale, Samuel I. Stupp^*