Highly Efficient Integrated Perovskite Solar Cells Containing a Small Molecule-PC70BM Bulk Heterojunction Layer with an Extended Photovoltaic Response Up to 900 nm

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• 作者：Ming Cheng ; Cheng Chen ; Kerttu Aitola ; Fuguo Zhang ; Yong Hua ; Gerrit Boschloo ; Lars Kloo ; Licheng Sun
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：28
• 期：23
• 页码：8631-8639
• 全文大小：571K
• ISSN：1520-5002

文摘

We demonstrate a high efficiency perovskite solar cell (PSC) integrated with a bulk heterojunction layer, based on acceptor–donor–acceptor (A–D–A) type hole transport material (HTM) and PC₇₀BM composite, yielding improved photoresponse. Two A–D–A-structured hole transporting materials termed M3 and M4 were designed and synthesized. Applied as HTMs in PSCs, power conversion efficiencies (PCEs) of 14.8% and 12.3% were obtained with M3 and M4, respectively. The HTMs M3 and M4 show competitive absorption, but do not contribute to photocurrent, resulting in low current density. This issue was solved by mixing the HTMs with PC₇₀BM to form a bulk heterojunction (BHJ) layer and integrating this layer into the PSC as hole transport layer (HTL). Through careful interface optimization, the (FAPbI₃)_0.85(MAPbBr₃)_0.15/HTM:PC₇₀BM integrated devices showed improved efficiencies of 16.2% and 15.0%, respectively. More importantly, the incident-photon-to-current conversion efficiency (IPCE) spectrum shows that the photoresponse is extended to 900 nm by integrating the M4:PC₇₀BM based BHJ and (FAPbI₃)_0.85(MAPbBr₃)_0.15 layers.