d="p0010">D-π-A type chromophores using the tetrathioacene unit have been synthesized for 2PA.
dd><dt class="label">•dt><dd>d="p0015">The optoelectronic, chemical and physical properties were systematically studied.
dd><dt class="label">•dt><dd>d="p0020">The 2PA cross section values can be enhanced by the insertion of an additional thiophene unit into the appropriate position.
dd>dl>