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(a) UV-vis absorption spectra for the hole transport material (HTM) with and without In2 and (b) top view SEM images of films with and without In2. Reprinted from [149] with permission. Copyright© 2017, WILEY. (c) The UV-vis absorption spectra of the HTM with different amounts of In10 and (d) top view SEM images of HTM, HTM/In10-2, HTM/In10-4, and HTM/In10-6. Reprinted from [152] with permission. Copyright© 2019, Elsevier.
