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Modulation of Three p-Type Polymers Containing a Fluorinated-Thiophene-Fused-Benzotriazole Unit To Pair with a Benzotriazole-Based Non-fullerene Acceptor for High VOC Organic Solar Cells
Macromolecules ( IF 5.1 ) Pub Date : 2019-11-04 , DOI: 10.1021/acs.macromol.9b01569 You Chen 1, 2 , Xiu Jiang 3 , Xingguo Chen 3 , Jialing Zhou 1, 2 , Ailing Tang 1 , Yanfang Geng 1 , Qiang Guo 4 , Erjun Zhou 1, 2, 4
Macromolecules ( IF 5.1 ) Pub Date : 2019-11-04 , DOI: 10.1021/acs.macromol.9b01569 You Chen 1, 2 , Xiu Jiang 3 , Xingguo Chen 3 , Jialing Zhou 1, 2 , Ailing Tang 1 , Yanfang Geng 1 , Qiang Guo 4 , Erjun Zhou 1, 2, 4
Affiliation
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Three 6-fluoro-thieno[2′,3′:4,5]benzo[1,2-d][1,2,3]triazole (fBTAZT) containing copolymers, named as PfBTAZT-H, PfBTAZT-F, and PfBTAZT-Cl, were employed to pair with a benzo[1,2-d][1,2,3]triazole (BTA) based non-fullerene acceptor BTA3 for the applicaition in organic solar cells (OSCs). By introducing fluorine or chlorine atoms into the thiophene side chains on BDT units, the highest occupied molecular orbital (HOMO) energy levels of polymers shift down in sequence, and PfBTAZT-Cl shows an obvious blue-shift of absorption spectrum. PfBTAZT-F:BTA3-based OSC attains a VOC of 1.05 V, a JSC of 11.83 mA cm–2, and FF of 0.62, leading to a PCE of 7.69%, which are higher than that of PfBTAZT-H:BTA3 (VOC = 0.99 V, JSC = 11.60 mA cm–2, FF = 0.58, and PCE = 6.65%) due to its well-matched HOMO energy level, higher charge mobilities, and favorable film morphology. More surprisingly, chlorinated polymer PfBTAZT-Cl obtains the highest VOC of 1.20 V and PCE of 8.00%, which is attributed to the lowest HOMO energy level, largely decreased voltage loss (ΔVloss = 0.56 V compared to 0.77 V for PfBTAZT-H:BTA3 0.71 V for PfBTAZT-F:BTA3), more complementary absorption with that of BTA3, and effective charge generation. Our results demonstrate that chlorination is an effective approach to realize a high PCE and VOC and thiophene-fused benzotriazole (BTAZT) based polymers are also good candidates for material combinations in “Same-A-Strategy” (SAS).
中文翻译：
含氟-噻吩基-熔融苯并三唑单元的三种p型聚合物与基于苯并三唑的非富勒烯受体配对的高V OC有机太阳能电池的调制
三种含6-氟噻吩并[2'，3'：4,5]苯并[1,2- d ] [1,2,3]三唑（fBTAZT）的共聚物，分别称为PfBTAZT-H，PfBTAZT-F和使用PfBTAZT-Cl与基于苯并[1,2- d ] [1,2,3]三唑（BTA）的非富勒烯受体BTA3配对，用于有机太阳能电池（OSC）。通过将氟或氯原子引入BDT单元上的噻吩侧链，聚合物的最高占据分子轨道（HOMO）能级顺序下降，PfBTAZT-Cl显示出吸收光谱的明显蓝移。PfBTAZT-F：基于BTA3的OSC的V OC为1.05 V，J SC为11.83 mA cm –2和FF为0.62，导致PCE为7.69％，高于PfBTAZT-H：BTA3（V OC = 0.99 V，J SC = 11.60 mA cm –2，FF = 0.58，PCE = 6.65％ ）由于其具有良好匹配的HOMO能级，更高的电荷迁移率和良好的薄膜形态。更令人惊讶地，氯化聚合物PfBTAZT-CL获得最高V OC 1.20 V和的8.00％，这归因于最低HOMO能级PCE的，这主要是降低的电压损失（Δ V损失= 0.56 V，而PfBTAZT-H：BTA3为0.77 V，PfBTAZT-F：BTA3为0.71 V），与BTA3的吸收互补性更高，并且产生了有效的电荷。我们的结果表明，氯化是实现高PCE和V OC的有效方法，基于噻吩的苯并三唑（BTAZT）基聚合物也是“相同A策略”（SAS）中材料组合的良好候选者。
更新日期：2019-11-04
中文翻译：
含氟-噻吩基-熔融苯并三唑单元的三种p型聚合物与基于苯并三唑的非富勒烯受体配对的高V OC有机太阳能电池的调制
三种含6-氟噻吩并[2'，3'：4,5]苯并[1,2- d ] [1,2,3]三唑（fBTAZT）的共聚物，分别称为PfBTAZT-H，PfBTAZT-F和使用PfBTAZT-Cl与基于苯并[1,2- d ] [1,2,3]三唑（BTA）的非富勒烯受体BTA3配对，用于有机太阳能电池（OSC）。通过将氟或氯原子引入BDT单元上的噻吩侧链，聚合物的最高占据分子轨道（HOMO）能级顺序下降，PfBTAZT-Cl显示出吸收光谱的明显蓝移。PfBTAZT-F：基于BTA3的OSC的V OC为1.05 V，J SC为11.83 mA cm –2和FF为0.62，导致PCE为7.69％，高于PfBTAZT-H：BTA3（V OC = 0.99 V，J SC = 11.60 mA cm –2，FF = 0.58，PCE = 6.65％ ）由于其具有良好匹配的HOMO能级，更高的电荷迁移率和良好的薄膜形态。更令人惊讶地，氯化聚合物PfBTAZT-CL获得最高V OC 1.20 V和的8.00％，这归因于最低HOMO能级PCE的，这主要是降低的电压损失（Δ V损失= 0.56 V，而PfBTAZT-H：BTA3为0.77 V，PfBTAZT-F：BTA3为0.71 V），与BTA3的吸收互补性更高，并且产生了有效的电荷。我们的结果表明，氯化是实现高PCE和V OC的有效方法，基于噻吩的苯并三唑（BTAZT）基聚合物也是“相同A策略”（SAS）中材料组合的良好候选者。
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