The Synthesis Of Hole Transport Materials Based On Triphenylamine And Its Application In Perovskite Solar Cells

Recently,organic-inorganic hybrid perovskite solar cells(PSCs)have attracted much attention due to their simple preparation process,good charge-carrier transport and high photovoltaic performance.Hole transport materials play very indispensable role in PSCs,which can efficiently transport holes,and they can directly affect the photovoltaic performance of device.Therefore,the development of new hole transport materials has become one of the effective ways to improve device performance.Triphenylamine-based small organic molecules have many advantages and widely applied in PSCs,they have strong electron donating ability,high hole mobility and good hydrophobicity.In this thesis,six triphenylamine-based hole transport materials were synthesized by changing the core group in these molecules(OY1,OY2,OY3 and QY1,QY2,QY3)and applied to perovskite solar cells.The OY and QY target products are prepared with carbazole derivatives,thiophene and fluorene derivatives as the core groups,and triphenylamine as the peripheral end-capping group through bromination reaction and acylation reaction,their structures are confirmed by mass spectrometry and ~1H NMR.This paper studies the molecular structure,physical properties,electrochemistry and hole mobility of the target products,and uses it in perovskite solar cells to test the output current-voltage and long-term stability of the devices.The devices based on OY1,OY2 and OY3 show power conversion efficiencies(PCEs)of19.14%,19.69%,and 20.34%,respectively.The OY3-based cell maintained 84.33%of its initial value after aging for 480 hours under unpackaged conditions.The efficiencies of the batteries based on QY1,QY2 and QY3 were 18.23%,18.52%,and 19.28%,respectively,and their efficiencies maintained 77.69%,79.53%and 83.95%of the initial values after 480 hours,respectively.We systematically investigated the effect of the core groups onto the photovoltaic performance of PSCs,which can provide some effective insights for the development of hole transport materials.