Enhancement of Photovoltaic Performance by Utilizing Readily Accessible Hole Transporting Layer of Vanadium(V) Oxide Hydrate in a Polymer–Fullerene Blend Solar Cell

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• 作者：Youyu Jiang ; Shengqiang Xiao ; Biao Xu ; Chun Zhan ; Liqiang Mai ; Xinhui Lu ; Wei You
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：8
• 期：18
• 页码：11658-11666
• 全文大小：546K
• 年卷期：0
• ISSN：1944-8252

文摘

Herein, a successful application of V₂O₅·nH₂O film as hole transporting layer (HTL) instead of PEDOT:PSS in polymer solar cells is demonstrated. The V₂O₅·nH₂O layer was spin-coated from V₂O₅·nH₂O sol made from melting-quenching sol–gel method by directly using vanadium oxide powder, which is readily accessible and cost-effective. V₂O₅·nH₂O (n ≈ 1) HTL is found to have comparable work function and smooth surface to that of PEDOT:PSS. For the solar cell containing V₂O₅·nH₂O HTL and the active layer of the blend of a novel polymer donor (PBDSe-DT2PyT) and the acceptor of PC₇₁BM, the PCE was significantly improved to 5.87% with a 30% increase over 4.55% attained with PEDOT:PSS HTL. Incorporation of V₂O₅·nH₂O as HTL in the polymer solar cell was found to enhance the crystallinity of the active layer, electron-blocking at the anode and the light-harvest in the wavelength range of 400–550 nm in the cell. V₂O₅·nH₂O HTL improves the charge generation and collection and suppress the charge recombination within the PBDSe-DT2PyT:PC₇₁BM solar cell, leading to a simultaneous enhancement in V_oc, J_sc, and FF. The V₂O₅·nH₂O HTL proposed in this work is envisioned to be of great potential to fabricate highly efficient PSCs with low-cost and massive production.