Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Suppressed Defects by Functional Thermally Cross?Linked Fullerene for High?Efficiency Tin?Lead Perovskite Solar Cells
Mixed tin?lead?based perovskite solar cells with ideal bandgap (1.2 eV) develop rapidly, while the top interface defects and Sn oxidation cannot be solved simultaneously. It is found cross?linkable [6,6]?phenyl?C61?butyric styryl dendron ester (C?PCBSD) can coordinate with perovskite and optimize the interface and bulk of perovskite. This work demonstrates the optimization effect of C?PCBSD on perovskite interface and bulk.Mixed tin?lead (Sn?Pb) perovskites have attracted the attention of the community due to their narrow bandgap, ideal for photovoltaic applications, especially tandem solar cells. However, the oxidation and rapid crystallization of Sn2+ and the interfacial traps hinder their development. Here, cross?linkable [6,6]?phenyl?C61?butyric styryl dendron ester (C?PCBSD) is introduced during the quenching step of perovskite thin film processing to suppress the generation of surface defects at the electron transport layer interface and improve the bulk crystallinity. The C?PCBSD has strong coordination ability with Sn2+ and Pb2+ perovskite precursors, which retards the crystallization process, suppresses the oxidation of Sn2+, and improves the perovskite bulk and surface crystallinity, yielding films with reduced nonradiative recombination and enhanced interface charge extraction. Besides, the C?PCBSD network deposited on the perovskite surface displays superior hydrophobicity and oxygen resistance. Consequently, the devices with C?PCBSD obtain PCEs of up to 23.4% and retained 97% of initial efficiency after 2000 h of storage in a N2 atmosphere.
» Publication Date: 20/07/2024
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
