Despite the advanced efficiency of perovskite solar cells(PSCs),electron transportation is still a pending issue.Here the polymer polyvinylpyrrolidone(PVP)is used to enhance the electron injection,which is thanks to t...Despite the advanced efficiency of perovskite solar cells(PSCs),electron transportation is still a pending issue.Here the polymer polyvinylpyrrolidone(PVP)is used to enhance the electron injection,which is thanks to the passivation of the defects at the interface between the ZnO electron transporting layer(ETL)and the perovskite.The application of the PVP layer inhibits the device degradation,and 80%of the primary efficiency is kept after 30 d storage in air condition.Additionally,the efficiency of the device is further enhanced by improving the conductivity and crystallinity of the ZnO ETL via Magnesium(Mg)doping in the ZnO nanorods(ZnO NRs).Moreover,the preparation parameters of the ZnO NRs are optimized.By employing the high-crystallinity ZnO ETL and the PVP layer,the power conversion efficiency(PCE)of the champion device is increased from 16.29%to 19.63%.These results demonstrate the advantages of combining mesoscale manipulation with interface modification and doping together.展开更多
The highly developed flexible electronics puts forward higher requirements for the stretchable strain sensors with excellent multiple performances. Herein, a simple and economical fabrication strategy is adopted to ob...The highly developed flexible electronics puts forward higher requirements for the stretchable strain sensors with excellent multiple performances. Herein, a simple and economical fabrication strategy is adopted to obtain a new strain sensor based on Ecoflex rubbers, three-dimensional(3D) graphene foams(GrF) and modified silicone rubber(MSR). The device possesses high stretchability(tolerable strain up to 100%) with a variety of capabilities, such as pressure and strain sensing, strain visualization and straincontrolled heating. The GrF with excellent electrical property and MSR with ideal mechanical property endow the sensor with a wide sensing range(up to 100% strain and 66 kPa stress), high sensitivity(gauge factor of 584.2 within the strain range of 80%–100% and sensitivity of 0.183 kPa-1 in 5–10 kPa)and long cycle life(more than 10,000 cycles) for pressure/strain sensing. In addition, the temperature of the device can be increased 35°C in 5 min under 5 V. Based on this, the deformation is visible to the naked eyes by the color conversion of thermochromic MSR. The soft and reversible strain sensor can be served as the electronic skin(e-skin) for real-time and high accuracy detecting of electrophysiological stimuli, a wearable heater for thermotherapy or body warming and even intelligent visual-touch panel.展开更多
基金Project supported by Beijing Natural Science Foundation,China(Grant No.2202030)the National Natural Science Foundation of China(Grant No.41422050303)+1 种基金the Program of Introducing Talents of Discipline to Universities(Grant No.B14003)the Fundamental Research Funds for Central Universities,China(Grant Nos.FRF-GF-19-001A and FRF-GF-19-002B).
文摘Despite the advanced efficiency of perovskite solar cells(PSCs),electron transportation is still a pending issue.Here the polymer polyvinylpyrrolidone(PVP)is used to enhance the electron injection,which is thanks to the passivation of the defects at the interface between the ZnO electron transporting layer(ETL)and the perovskite.The application of the PVP layer inhibits the device degradation,and 80%of the primary efficiency is kept after 30 d storage in air condition.Additionally,the efficiency of the device is further enhanced by improving the conductivity and crystallinity of the ZnO ETL via Magnesium(Mg)doping in the ZnO nanorods(ZnO NRs).Moreover,the preparation parameters of the ZnO NRs are optimized.By employing the high-crystallinity ZnO ETL and the PVP layer,the power conversion efficiency(PCE)of the champion device is increased from 16.29%to 19.63%.These results demonstrate the advantages of combining mesoscale manipulation with interface modification and doping together.
基金supported by the National Natural Science Foundation of China (51572025)the National Foundation of China (41422050303)+2 种基金the Program of Introducing Talents of Discipline to Universities (B14003)Beijing Municipal Science Technology Commissionthe Fundamental Research Funds for Central Universities
文摘The highly developed flexible electronics puts forward higher requirements for the stretchable strain sensors with excellent multiple performances. Herein, a simple and economical fabrication strategy is adopted to obtain a new strain sensor based on Ecoflex rubbers, three-dimensional(3D) graphene foams(GrF) and modified silicone rubber(MSR). The device possesses high stretchability(tolerable strain up to 100%) with a variety of capabilities, such as pressure and strain sensing, strain visualization and straincontrolled heating. The GrF with excellent electrical property and MSR with ideal mechanical property endow the sensor with a wide sensing range(up to 100% strain and 66 kPa stress), high sensitivity(gauge factor of 584.2 within the strain range of 80%–100% and sensitivity of 0.183 kPa-1 in 5–10 kPa)and long cycle life(more than 10,000 cycles) for pressure/strain sensing. In addition, the temperature of the device can be increased 35°C in 5 min under 5 V. Based on this, the deformation is visible to the naked eyes by the color conversion of thermochromic MSR. The soft and reversible strain sensor can be served as the electronic skin(e-skin) for real-time and high accuracy detecting of electrophysiological stimuli, a wearable heater for thermotherapy or body warming and even intelligent visual-touch panel.
