材料科学
开路电压
聚合物
接受者
富勒烯
带隙
电子受体
混合太阳能电池
能量转换效率
有机太阳能电池
电压
太阳能电池
光电子学
聚合物太阳能电池
纳米技术
光化学
有机化学
电气工程
复合材料
物理
化学
凝聚态物理
工程类
作者
Shengjian Liu,Xin Song,Simil Thomas,Zhipeng Kan,Federico Cruciani,Frédéric Laquai,Jean‐Luc Brédas,Pierre M. Beaujuge
标识
DOI:10.1002/aenm.201602574
摘要
While polymer acceptors are promising fullerene alternatives in the fabrication of efficient bulk heterojunction (BHJ) solar cells, the range of efficient material systems relevant to the “all‐polymer” BHJ concept remains narrow, and currently limits the perspectives to meet the 10% efficiency threshold in all‐polymer solar cells. This report examines two polymer acceptor analogs composed of thieno[3,4‐ c ]pyrrole‐4,6‐dione (TPD) and 3,4‐difluorothiophene ([2F]T) motifs, and their BHJ solar cell performance pattern with a low‐bandgap polymer donor commonly used with fullerenes (PBDT‐TS1; taken as a model system). In this material set, the introduction of a third electron‐deficient motif, namely 2,1,3‐benzothiadiazole (BT), is shown to (i) significantly narrow the optical gap ( E opt ) of the corresponding polymer (by ≈0.2 eV) and (ii) improve the electron mobility of the polymer by over two orders of magnitude in BHJ solar cells. In turn, the narrow‐gap P2TPDBT[2F]T analog ( E opt = 1.7 eV) used as fullerene alternative yields high open‐circuit voltages ( V OC ) of ≈1.0 V, notable short‐circuit current values ( J SC ) of ≈11.0 mA cm −2 , and power conversion efficiencies (PCEs) nearing 5% in all‐polymer BHJ solar cells. P2TPDBT[2F]T paves the way to a new, promising class of polymer acceptor candidates.
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