Nickel-based MOFs As The Hole Transporting Layer For Perovskite Solar Cells

The research on perovskite solar cells have been exploded during the past decade.Up to now,there are a large number of researchers focusing their attention on the study including device structure,the materials in each layer of the device,the stability,efficiency,low toxicity or non-toxic of the overall device.As an important component in the perovskite solar cell,the hole transport layer material is one of the most important effect on the final solar cells.However,the traditional hole transport materials have low carrer mobility and instability,moreover,there are lack of alternative options for hole transport materials.Therefore,it is necessary to find new hole transport materials for solar cells.Recently,conductive metal organic frameworks(MOFs),a new kind of semiconductor materials,are considered to be an available choice for ideal hole transport materials due to simple preparation,low cost and easy film formation at room temperature.In this thesis,we reported the electrically conductive MOFs,Ni3(HITP)2,as the hole transport materials.By choosing the preparation method,optiruizing the preparation conditions and characterizing comprehensively,we have successfully prepared high quality MOFs thin films with thickness of 30 nm and roughness of only 5.6 nm.Also,the MOFs materials showed the advantages of high hole mobility,good thermal stability and low temperature film formation.Moreover,MOFs are demonstrated to be the inverted(p-i-n type)perovskite solar cells with negligible J-V hysteresis effect.At last,a champion power conversion efficiency(10.3%)of the perovskite solar cell is obtained from MOFs material Ni3(HITP)2 as an dopant-free hole transport layer.This work provides an alternative hole transport material for other devices and promotes the development of perovskite solar cells.