Self-Organized Small Molecules in Robust MOFs for High-Performance Perovskite Solar Cells with Enhanced Degradation Activation Energy

摘要

A brand new strategy to improve the volatility and disordered arrangement ofsmall organic molecule additives within doped perovskite solar cells throughthe construction of metal–organic frameworks (MOFs) is proposed. TheZn-TTB, self-assembling from Zn~（2+） and 1-(triazol-1-ly)-4-tetrazol-5-ylmethyl)benzene (TTB), inherits and arranges triazole and tetrazole groups and forms along-chain structure surrounding metal nodes. The perovskite precursors growalong with the skeleton of Zn-TTB and produce a macromolecular intermediatephase via the MOFs-perovskite interconnection, subsequently formingsuperior perovskite films with enhanced stability with respect to molecularadditives, as evidenced by in situ thermogravimetry-Fourier transforminfrared spectroscopy measurements. Thermal analyses suggest MOF-dopingincreases degradation activation energies by up to >174.01 kJ mol–1 comparedto the reference sample (162.45 kJ mol–1). Zn-TTB-modified devices exhibitpromising efficiencies (up to 23.14) and operational stability in unencapsulatedstate, even under constant solar light illumination.