Study On Flexible Perovskite Optoelectronic Device Based On Ultrathin Metal Electrode

Flexible perovskite solar cell is a new type of flexible thin film battery developed on the basis of hard perovskite solar cell.By using a variety of flexible substrates,it can achieve the purpose of being bendable and foldable,which greatly expands application scenarios of perovskite solar cells.Flexible perovskite solar cells,which are based on ultra-thin metal electrodes,can achieve good flexibility in the laboratory.It’s technical key lies in the selection of suitable flexible substrates,the preparation of high-performance ultra-thin metal electrodes and the improvement of the preparation process of flexible perovskite solar cells.In this paper,starting from the latter two perspectives,a high-performance ultra-thin metal electrode is prepared by using a metal-polymer hybrid induced nucleation seed layer,and its mechanism of action is explored;by using ultra-thin PEI,the processing temperature of the tin dioxide electron transport layer is reduced to make it compatible with flexible polymer substrates which is not resistant to high temperaturet,and ITO-PEN-based flexible perovskite solar cells are prepared;based on the above research in the preparation process,an ultra-thin Au film is used as a transparent conductive electrode to prepare a n-i-p type flexible perovskite solar cell with high flexibility.The main work of the full text is as follows:1)The effect of metal-polymer mixed nucleation seed layer on the growth mechanism and performance of ultra-thin Ag film is studied.By using the Au/PEI double-layer induced nucleation seed layer,a high-performance ultra-thin Ag transparent conductive film with a percolation threshold thickness of only 3 nm is successfully prepared.The Au/PEI/8 nm Ag/30 nm Ta₂O₅（APAT）electrode exhibits photoelectric performance which is comparable to current commercial ITO,and also exhibits excellent environmental stability and high mechanical stability that ITO does not have.2)The effect of ultra-thin PEI layer on tin dioxide electron transport layer and flexible perovskite solar cells is studied.The ultra-thin PEI layer is inserted between the ITO transparent conductive electrode and the tin dioxide electron transport layer by spin coating and water washing.Using the high-density amine groups on the long-chain polymer in the ultra-thin PEI layer,the ITO transparent conductive electrode and the tin dioxide electron transport layer are firmly adsorbed together,which reduces the annealing temperature of the tin dioxide electron transport layer（<100℃）,the preparation process is compatible with the polymer substrate,an ITO-PEN based flexible perovskite solar cell with an energy conversion efficiency of 16.3%is successfully prepared.3)Combining the work of the first two parts,the SnO₂/Au/SnO₂（SAS）electrode is prepared by using a metal-polymer mixed nucleation seed layer,which is used as the transparent conductive electrode of a flexible perovskite solar cell.The energy conversion efficiency of the prepared SAS-PEN-based flexible perovskite solar cell has reached 10.9%,and has excellent flexibility,which is of great significance for the future research and development of wearable optoelectronic devices.