Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
We report here the design and synthesis of a series of conjugated molecules based on thieno[3,4-c]pyrrole-4,6-dione central core in a D–π-A–π-D molecular configuration for perovskite solar cells application. The thermal, morphological, optical and electrochemical properties of all prepared compounds have been investigated in detail and a comparative discussion has been presented.
Their characteristics have suggested that these molecules could be suitable for use as hole transporting materials in perovskite photovoltaic devices. The preliminary photovoltaic application have given devices with power conversion efficiency (PCE) around 17 %. One of these molecules has been selected for further device optimization. Interface engineering with 2-(2-aminoethyl)thiophene hydroiodide (2-TEAI) between perovskite and hole transport layers improves PCE from 19.60% (untreated) to 21.98% (treated) and this champion PCE is even higher than that of the spiro-MeOTAD-based device (21.15%). Thermal stability test at 85 oC for over 1000 h showed that the PSC employed novel HTM retains 85.9% of initial PCE (from 21.9% (0 h) to 18.8% (1032 h)), while the spiro-MeOTAD-based PSC degrades unrecoverably from 21.1% to 5.8%. Time-of-flight secondary ion mass spectrometry studies combined with Fourier transformed infrared spectroscopy reveal that novel HTM shows much lower lithium ion diffusivity than spiro-MeOTAD due to a strong complexation of the lithium ion with HTM, which is responsible for the higher degree of thermal stability. Under optimized condition, the perovskite solar cells employed additive-free HTM gave a PCE of 15.91%. This work delivers an important message that capturing mobile Li+ in hole transporting layer is critical in designing novel HTM for improving thermal stability of PSCs. In addition, it also highlights the importance of interfacial engineering on the non-conventional HTM.
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and ICT (MSIT) of Korea under contracts NRF-2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System), NRF-2016M3D1A1027663 and NRF-2016M3D1A1027664 (Future Materials Discovery Program). This research was in part supported by Energy Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), funded by the Ministry of Trade, Industry & Energy (No. 20193091010310) and the Defense Challengeable Future Program of the Agency for Defense Development. S.-G.K. is grateful to NRF for the Global Ph.D. Fellowship (Basic Science Research Program under contact 2016R1A2B3008845 and NRF-2017H1A2A1046990). T.H.L. thanks the Vietnamese government for the doctoral scholarship (Program 911 USTH). The works at CY Cergy Paris Université is funded by French National Research Agency (Agence Nationale de la Recherche, ANR) through two projects: ESPOIR2 (ANR JCJC, Project Number: ANR-17-CE05-0006) and FUTUR as part of Paris Seine Initiative / ANR PIA (Project Number: ANR-16-IDEX-0008). N.-G.P. and T.-T.B. thank the Hubert Curien Partnership (PHC STAR 2015, project number 34301QH) for financially supporting us to initiate this French-Korean research collaboration.
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