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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
Multifunctional Dicarboxylic Acid Molecules Enable 19.61% Efficiency in Carbon-Based Printable Mesoscopic Perovskite
Yongxiang Cai1, Dongjie Wang1, Xinyi Zhao1
1Engineering Research Center of Electronic Information Materials and Devices of Ministry of Education, Guangxi Key Laboratory of Information Materials, School of Materials Science and Engineering, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
None:
Printable mesoscopic perovskite solar cells (p-MPSCs) present notable advantages, including simple fabrication, low cost, and scalability. However, the three-dimensional interpenetrating network of the triple-layer mesoscopic structure complicates the crystallization of perovskite and tends to introduce more defects. In this work, the multifunctional dicarboxylic acid molecule 2,5-furandicarboxylic acid (FDCA) was incorporated to regulate the crystallization process of perovskite within the triple-layer mesoscopic structure. The symmetrically arranged carboxyl groups in FDCA serve as Lewis bases, passivating undercoordinated Pb2+ and thereby effectively suppressing nonradiative recombination. Meanwhile, FDCA formed strong interactions with the perovskite, effectively moderating its rapid crystallization and thereby promoting the dense filling and high-quality growth of the perovskite film in the triple-layer mesoscopic structure. Benefiting from the above synergistic effects of FDCA, the power conversion efficiency (PCE) of FDCA-modified p-MPSCs increased significantly from 18.17% to 19.61%. Furthermore, unencapsulated FDCA-modified devices retained over 90% of their initial PCE after being stored for 100 days in ambient air (25 ± 5 °C, 40 ± 5% RH), demonstrating excellent long-term stability.
