Investigation On The Performance Of Ternary Quantum Dots–Polymer Hybrid Solar Cell

Quantum dot?QDs?materials have the characteristics of low temperature synthesis,controllable size,high extinction coefficient,and good electrical conductivity.They have shown great advantages in infrared light,visible light,ultraviolet light detectors,light emitting devices,laser devices,and photovoltaic devices.Especially in the field of photovoltaic,the energy conversion efficiency?PCE?of PbS quantum dot solar cells has exceeded 11%.However,quantum dot materials are mainly based on binary semiconductor materials?such as CdSe,CdS,PbS,PbSe,Ag₂S,etc.?,and their types are limited.This requires us to develop ternary and even multiple quantum dot materials.Meanwhile,the quantum dots-polymer hybrid solar cell is a new method for the preparation of solar cells by a solution method,which has the advantages of low manufacturing cost,light weight,high efficiency,and the ability to prepare flexible large-area devices,which is favorable for large-scale production.There,three representative quantum dot materials are selected.Through material synthesis,device preparation and characterization,the application potential of ternary quantum dot materials in the photovoltaic field is introduced.For different materials,the performance of the ternary quantum dot-polymer solar cell device is improved by different methods.1.We obtained the uniform distribution and excellent dispersion of AgBiS₂ QDs by hot-injection.By using different surface ligands to treat AgBiS₂ quantum dot films to obtain different HOMO and LUMO values and different ligand replacement effects,AgBiS₂ quantum dot-polymer solar cells have different energy level structures and carrier transports ability and obtain different solar cell performance.We proved that in the quantum dots-polymer solar cells,the quantum dots and the polymers simultaneously contribute to the photocurrent of the solar device.2.For CsPbX₃ QDs,we use CsPbBr₃ as the representative.We used CsPbBr3 quantum dots coated with different surface ligands by thermal injection and low temperature synthesis.Comparing the performance of CsPbBr₃ QDs-PCE10 solar cells,the performance of solar cells corresponding to CsPbBr₃ synthesized by the low-temperature is better than that of the CsPbBr₃ synthesized by the hot-injection.This provides a new idea for the removal of long-chain ligands for other quantum dot materials.3.One-pot method was used to synthesize the colloidal AgSbS₂ QDs solution with uniform particle size distribution and superior dispersibility.Through characterization and analysis,we speculate that AgSbS₂ QDs have a great potential in the photovoltaic field,and explain the reasons.