Dinaphtho-s-indacene-based copolymers for inverted organic solar cells with high open-circuit voltages
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- 作者：Wenbin Fan<sup>asup><sup> ; sup><sup>bsup> ; Zhigang Yin<sup>bsup> ; Yunlong Ma<sup>bsup> ; Bingxi Wang<sup>asup><sup> ; sup><sup>wangbx08@163.com" class="auth_mailsup> ; Shanci Chen<sup>bsup> ; Changquan Tang<sup>bsup> ; Qingdong Zheng<sup>bsup><sup> ; sup><sup>qingdongzheng@fjirsm.ac.cn" class="auth_mailsup>
- 关键词：Conjugated polymers ; Dinaphtho-s-indacene ; Organic solar cells
- 刊名：Polymer
- 出版年：25 April, 2014
- 年：2014
- 卷：55
- 期：9
- 页码：2262-2270
- 全文大小：1873 K
文摘
We report on the synthesis and characterization of a series of donor-acceptor copolymers (<strong class="boldFont">PF1strong>, <strong class="boldFont">PF2strong>, <strong class="boldFont">PF3strong> or <strong class="boldFont">PF4strong>) based on a dinaphtho-s-indacene (<strong class="boldFont">DNIstrong>) donor unit and four different acceptor units. The molecular weights of the copolymers were determined by using gel permeation chromatography, and their electrochemical properties were investigated by cyclic voltammetry. All four copolymers showed deep-lying highest occupied molecular orbital energy levels. Inverted bulk heterojunction solar cells were fabricated by using the synthesized copolymers as the electron donor material and 6,6-phenyl-C71-butyric acid methyl ester (PC<sub>71sub>BM) as the electron acceptor material. Inverted solar cells based on <strong class="boldFont">PF1strong>:PC<sub>71sub>BM (1:4, w/w) exhibited a power conversion efficiency (PCE) of 3.07%, a high open-circuit voltage (V<sub>ocsub>) of 0.99聽V, a short-circuit current density (J<sub>scsub>) of 7.85聽mA/cm<sup>2sup>, and a fill factor of 39.5% under the AM1.5G illumination. With the same fabrication method, the inverted devices based on <strong class="boldFont">PF2strong>, <strong class="boldFont">PF3strong> and <strong class="boldFont">PF4strong> showed PCEs of 2.62, 1.18 and 1.32%, and V<sub>ocsub> values of 0.97, 0.91 and 0.80聽V, respectively.