论文部分内容阅读
Self-charging perovskite photocapacitors (SCPPs) that has dual functions of solar energy harvest and storage can provide reliable,sustainable and off-grid power supply for electrical devices.Currently the majority of reported SCPPs are fabricated on heavy and rigid conductive glass substrates due to the high annealing temperature requirement of making electron transport layer such as TiO2 in the perovskite solar cells (PSCs).Practically,flexible and lightweight photocapacitors are highly desirable for applications such as portable and wearable electronics.Herein,we demonstrate a monolithic SCPP with parallel structure by integrating a PSC using amorphous WOx based electron transport layer deposited at room temperature and a quasi-solid-state carbon based symmetrical supercapacitor (SC).The WOx film with 26 nm thickness yielded a champion power conversion efficiency of 14.14% and 10.80% with the FTO/glass rigid and the ITO/PEN flexible PSCs,respectively.Investigation of the performance for the photocapacitors with the rigid substrate (r-SCPP) and the flexible substrate (f-SCPP) exhibited that the r-SCPP could be photo-charged to 0.68 V within 20 s while the f-SCPP required 25 s to be charged to 0.65 V.Consequently,an overall conversion efficiency of2.13% and 1.27% were obtained with the r-SCPP and the f-SCPP,respectively.This work paves a new way towards making SCPPs that may serve as off-grid electrical power supply in the future.