10.1021/acsami.6b14916.s001 Liangying Wang Liangying Wang Bin Dong Bin Dong Rile Ge Rile Ge Fengxing Jiang Fengxing Jiang Jingkun Xu Jingkun Xu Fluorene-Based Two-Dimensional Covalent Organic Framework with Thermoelectric Properties through Doping American Chemical Society 2017 Doping Organic semiconductors fluorene units COF fluorene-based covalent Seebeck coefficient power factor Fluorene-Based Two-Dimensional Covalent Organic Framework material room temperature framework BET surface area Thermoelectric Properties charge carrier mobility FL-COF 2017-02-13 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Fluorene-Based_Two-Dimensional_Covalent_Organic_Framework_with_Thermoelectric_Properties_through_Doping/4668757 Organic semiconductors have great potential as flexible thermoelectric materials. A fluorene-based covalent organic framework (FL-COF-1) was designed with the aim of creating an enhanced π–π interaction among the crystalline backbones. By the introduction of fluorene units into the frameworks, the FL-COF-1 had high thermal stability with a BET surface area over 1300 m<sup>2</sup> g<sup>–1</sup>. The open frameworks were favorable for doping with iodine and followed with the improved charge carrier mobility. The compressed pellet of I<sub>2</sub>@FL-COF-1 exhibited a high Seebeck coefficient of 2450 μV K<sup>–1</sup> and power factor of 0.063 μW m<sup>–1</sup> K<sup>–2</sup> at room temperature, giving the first example of COFs’ potential application as thermoelectric materials.