journal article·2019-06-25

Design, Synthesis, and Postvapor Treatment of Neutral Fulleropyrrolidine Electron-Collecting Interlayers for High-Efficiency Inverted Polymer Solar Cells

Yanting Gong, Jiandong Zhang, Bin Du, Mengyi Wang, Wen-Yong Lai, Wei Huang

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Abstract

A novel fullerene derivative (FBPNOH) grafted with bilateral polar pendants was explored as an efficient electron-collecting layer (ECL) for inverted polymer solar cells (i-PSCs). Using PTB7-Th:PC71BM as the photoactive material, the devices based on FBPNOH achieved power conversion efficiencies (PCEs) exceeding 8.85%, which are higher than those of the reference devices based on sol–gel ZnO. The impact of postsolvent treatment on the interfacial properties and charge transport ability of interlayers and the corresponding optoelectronic characteristics have been systematically investigated in comparison with those of its unilateral counterpart (FPNOH). The results show that the post-solvent annealing process is beneficial for enhancing the carrier transport and extraction characteristics of fullerene-based ECLs for PSCs. Meanwhile, according to ultraviolet photoelectron spectroscopy, dimethylformamide solvent annealing can further reduce the work function of indium tin oxide. The electron-selective device tests confirmed the improvement in the charge transport ability for the solvent-annealed films, which boosted PCEs to 9.49% and 10.05% for the typical i-PSCs based on FBPNOH and FPNOH as the ECL, respectively. Our findings shed light on further optimizing the molecular design and device engineering of ECLs for photovoltaic applications.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China

Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi’an 710072, Shaanxi, China

Funding

Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · Government of Jiangsu Province · Nanjing University of Posts and Telecommunications · National Natural Science Foundation of China · Central Committee of the Communist Party of China · Postdoctoral Science Foundation of Jiangsu Province · Key Laboratory for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications · Excellent Scientific and Technological Innovative Teams of Jiangsu Higher Education Institutions · Priority Academic Program Development of Jiangsu Higher Education Institutions · Scientific Foundation · Synergetic Innovation Center for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications

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