Enhancing the performance of n-i-p perovskite solar cells by introducing hydroxyethylpiperazine ethane sulfonic acid for interfacial adjustment
Putao Zhang, Yiming Chen, Shenghan Wu, Xiaohui Li, Meiyue Liu, Shengjun Li
Abstract
/HEPES ETL reaches 20.22%, which is 9.7% higher than that of the control (18.43%), and the device stability is also significantly improved. The improvement in the device performance is mainly due to the introduction of the HEPES interface layer to adjust the interface energy level, which also improves the crystallinity of the perovskite film and reduces the interface defects. Electrochemical impedance spectroscopy and transient photovoltage/photocurrent results show that the HEPES-modified PSCs have lower charge transfer resistance, weaker leakage current intensity and improved interfacial charge separation and transport.
Topics & Concepts
PhotocurrentDielectric spectroscopyMaterials scienceCrystallinityEnergy conversion efficiencyPerovskite (structure)HEPESPassivationSulfonic acidChemical engineeringOptoelectronicsLayer (electronics)ElectrochemistryElectrodeNanotechnologyChemistryComposite materialPolymer chemistryPhysical chemistryBiochemistryEngineeringPerovskite Materials and ApplicationsConducting polymers and applicationsQuantum Dots Synthesis And Properties