Synthesis and characterization of a wide‐bandgap polymer based on perfluorinated and alkylthiolated benzodithiophene with a deep highest occupied molecular orbital level for organic photovoltaics,Journal of Polymer Science

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Synthesis and characterization of a wide‐bandgap polymer based on perfluorinated and alkylthiolated benzodithiophene with a deep highest occupied molecular orbital level for organic photovoltaics
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-09-07 , DOI: 10.1002/pol.20200480
Hyobin Ham ₁ , Hee su Kim ₂ , Do‐Hoon Hwang ₂ , In‐Nam Kang ₁

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A perfluorinated and alkylthiolated benzodithiophene (BDT)‐ttTPD‐based donor polymer (P2FS‐ttTPD) was synthesized via a Stille polymerization, and found to have a number average molecular weight (M_n) of 13,000 g/mol (Đ = 2.3). P2FS‐ttTPD has a wide bandgap (1.96 eV) and a deep highest occupied molecular orbital (HOMO) level (−5.70 eV). The perfluorination and alkylthiolation of the polymer backbone lower the polymer's HOMO level significantly. The hole and electron mobilities of P2FS‐ttTPD were determined to be 1.12 × 10⁻⁴ and 9.38 × 10⁻⁷ cm²/V s, respectively. Polymer solar cell devices prepared with a P2FS‐ttTPD:IT‐4F (1:1) blend as the active layer were found to exhibit power conversion efficiencies of 4.15%, a short‐circuit current density (J_SC) of 10.29 mA/cm², an open‐circuit voltage (V_OC) of 0.97 V, and a fill factor of 41.6%. The (1:1) blend devices were found to exhibit high V_OC and low E_loss values.

中文翻译：

基于全氟化和烷基硫代苯并二噻吩的宽带隙聚合物的合成和表征，其有机轨道光伏具有最高的最高分子轨道能级

通过Stille聚合合成了全氟化和烷硫基的苯并二噻吩（BDT）-ttTPD基供体聚合物（P2FS-ttTPD），发现其数均分子量（M _n）为13,000 g / mol（Đ = 2.3）。P2FS-ttTPD具有较宽的带隙（1.96 eV）和较深的最高占据分子轨道（HOMO）能级（−5.70 eV）。聚合物主链的全氟化和烷硫基化显着降低了聚合物的HOMO水平。确定P2FS-ttTPD的空穴迁移率和电子迁移率分别为1.12×10 ^-4和9.38×10 ^-7 cm ²/ V s分别。发现以P2FS-ttTPD：IT-4F（1：1）混合物作为活性层制备的聚合物太阳能电池器件的功率转换效率为4.15％，短路电流密度（J _SC）为10.29 mA / cm^{如图2所示}，开路电压（V _OC）为0.97 V，填充系数为41.6％。发现：（1 1）混合装置显示出高的V _OC和低ë_损失值。

更新日期：2020-10-02

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