• Frontiers of Optoelectronics
  • Vol. 9, Issue 1, 71 (2016)
Xiaoli ZHENG, Haining CHEN, Zhanhua WEI, Yinglong YANG, He LIN, and Shihe YANG*
Author Affiliations
  • Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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    Abstract

    This work explores the use of poly(3- hexylthiophene) (P3HT) modified carbon nanotubes (CNTs@P3HT) for the cathodes of hole transporter free, mesoscopic perovskite (CH3NH3PbI3) solar cells (PSCs), simultaneously achieving high-performance, high stability and low-cost PSCs. Here the thin P3HT modifier acts as an electron blocker to inhibit electron transfer into CNTs and a hydrophobic polymer binder to tightly cross-link the CNTs together to compact the carbon electrode film and greatly stabilize the solar cell. On the other hand, the presence of CNTs greatly improve the conductivity of P3HT. By optimizing the concentration of the P3HT modifier (2 mg/mL), we have improved the power conversion efficiencies (PCEs) of CNTs@P3HT based PSCs up to 13.43% with an average efficiency of 12.54%, which is much higher than the pure CNTs based PSCs (best PCE 10.59%) and the sandwich-type P3HT/CNTs based PSCs (best PCE 9.50%). In addition, the hysteresis of the CNTs@P3HT based PSCs is remarkably reduced due to the intimate interface between the perovskite and CNTs@P3HT electrodes. Degradation of the CNTs@ P3HT based PSCs is also strongly retarded as compared to cells employing the pure CNTs electrode when exposed to the ambient condition of 20%– 40% humidity.
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    Xiaoli ZHENG, Haining CHEN, Zhanhua WEI, Yinglong YANG, He LIN, Shihe YANG. High-performance, stable and low-cost mesoscopic perovskite(CH3NH3PbI3) solar cells based on poly(3-hexylthiophene)-modified carbon nanotube cathodes[J]. Frontiers of Optoelectronics, 2016, 9(1): 71
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    Category: RESEARCH ARTICLE
    Received: Dec. 1, 2015
    Accepted: Dec. 18, 2015
    Posted: Jan. 1, 2016
    Published Online: Oct. 21, 2016
    The Author Email: YANG Shihe (chsyang@ust.hk)