Accomplishment of Multifunctional π-Conjugated Polymers by Regulating the Degree of Side-Chain Fluorination for Efficient Dopant-Free Ambient-Stable Perovskite Solar Cells and Organic Solar Cells
Accomplishment of Multifunctional π-Conjugated Polymers by Regulating the Degree of Side-Chain Fluorination for Efficient Dopant-Free Ambient-Stable Perovskite Solar Cells and Organic Solar Cells
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DOI：
10.1021/acsami.7b09146
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发表时间：
2017-10-18
影响因子：
9.5
通讯作者：
Song, Myungkwan
中科院分区：
文献类型：
--
作者：
Kranthiraja, Kakaraparthi;Park, Sang Ho;Song, Myungkwan
我们提出了一种有效的方法来开发一系列多功能的聚酰亚胺共轭聚合物(P1-P3)，方法是通过控制与聚苯二噻吩基相连的侧链上的氟化度(F、2F和4F)。最有希望的变化是在改变侧链上氟原子的程度时，光学、电化学和形态性质发生了变化。钙钛矿和PCBM的正确排列的能级促使我们将它们用于钙钛矿太阳能电池(PSCs)作为空穴传输材料(HTMS)和体相异质结有机太阳能电池(BHJ OSCs)作为光活性施主。有趣的是，在无掺杂的PSCs中，P2(2F)和P3(4F)的功率转换效率(PCE)分别比PI(OF)(9.80%)提高了14.94%和10.35%。同样，在BHJ OSCs中，P2(2F)和P3(4F)的PCE也分别比P1(OF)改善7.93%和7.43%(PCE为4.35%)。基于P2和P3的光伏器件的高光伏性能与它们的能级排列、电荷传输、形态和堆积特性以及空穴转移产率有很好的相关性。此外，基于P1-P3的无掺杂剂PSCs和BHJ OSCs在30天内表现出良好的环境稳定性，初始性能没有明显下降。
We present an efficient approach to develop a series of multifunctional pi-conjugated polymers (P1-P3) by controlling the degree of fluorination (OF, 2F, and 4F) on the side chain linked to the benzodithiophene unit of the pi-conjugated polymer. The most promising changes were noticed in optical, electrochemical, and morphological properties upon varying the degree of fluorine atoms on the side chain. The properly aligned energy levels with respect to the perovskite and PCBM prompted us to use them in perovskite solar cells (PSCs) as hole-transporting materials (HTMs) and in bulk heterojunction organic solar cells (BHJ OSCs) as photoactive donors. Interestingly, P2 (2F) and P3 (4F) showed an enhanced power conversion efficiency (PCE) of 14.94%, 10.35% compared to PI (OF) (9.80%) in dopant-free PSCs. Similarly, P2 (2F) and P3 (4F) also showed improved PCE of 7.93% and 7.43%, respectively, compared to P1 (OF) (PCE of 4.35%) in BHJ OSCs. The high photvoltaic performance of the P2 and P3 based photovotaic devices over P1 are well correlated with their energy level alignment, charge transporting, morphological and packing properties, and hole transfer yields. In addition, the P1-P3 based dopant-free PSCs and BHJ OSCs showed an excellent ambient stability up to 30 days without a significant drop in their initial performance.