Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Publication date: 21st November 2022
The 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-OMeTAD) has a unique molecular structure suitable for the hole transporting layer (HTL) of perovskite solar cells (PSCs). However, the doping on spiro-OMeTAD reduces the long-term stability of the devices, thus it is important to develop dopant-free materials for HTL. The novel hole transporting polymer was designed and synthesized from commercially available low-cost monomers through a simple two-step synthesis. It can compare the chemical costs, including purification, PCDA1 polymer can be synthesized at $63/g, which is much cheaper than that required for the synthesis of HTM materials for PSCs; the commercialized prices of spiro-OMeTAD are about $500/g respectively. The newly synthesized polymer PCDA1 showed a promising power conversion efficiency of 11.01%, similar to the all-inorganic CsPbI2Br-based PSCs with doped Spiro-OMeTAD (11.88%). In terms of stability, Doped and dopant free The spiro-OMeTAD-based device was found to be much worse. Device stability and dissipation after 20 and 120 hours respectively PCDA1-based devices, which are dopant-free, unlike ambient air, are It showed a relatively constant PCE after the initial burn-in loss, Maintain at least 86% of initial efficiency after 120 hours. Thermal and photostability Devices also showed a similar trend with shelf life. stability. PCDA1-based devices without dopant Excellent shelf life, thermal stability and photostability PSC. In short, the dopant-free hole transporting polymer, thermal, light-soaking, and storage stability were greatly improved.
This study was supported by the National Research FoundationofKorea(2020R1A4A1018163, 2019R1A2C1089081 and 2021R1A4A1032515).
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