Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices stability.However,the strategies of suppressing photoinduced ph...Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices stability.However,the strategies of suppressing photoinduced phase segregation and related mechanisms have not been fully disclosed.Here,we report a new passivation agent 4-aminotetrahydrothiopyran hydrochloride(4-ATpHCl)with multifunctional groups for the interface treatment of a 1.77-eV wide-bandgap perovskite film.4-ATpH^(+)impeded halogen ion migration by anchoring on the perovskite surface,leading to the inhibition of phase segregation and thus the passivation of defects,which is ascribed to the interaction of 4-ATpH^(+)with perovskite and the formation of low-dimensional perovskites.Finally,the champion device achieved an efficiency of 19.32%with an open-circuit voltage(V_(OC))of 1.314 V and a fill factor of 83.32%.Moreover,4-ATpHCl modified device exhibited significant improved stability as compared with control one.The target device maintained 80%of its initial efficiency after 519 h of maximum power output(MPP)tracking under 1 sun illumination,however,the control device showed a rapid decrease in efficiency after 267 h.Finally,an efficiency of 27.38%of the champion 4-terminal all-perovskite tandem solar cell was achieved by mechanically stacking this wide-bandgap top subcell with a 1.25-eV low-bandgap perovskite bottom subcell.展开更多
The solar cells (SCs) are the most typical devices used toconvert the solar energy into electricity to help relieving the energyshortage crisis. In the photovoltaic (PV) communities, improvingthe power-conversion effi...The solar cells (SCs) are the most typical devices used toconvert the solar energy into electricity to help relieving the energyshortage crisis. In the photovoltaic (PV) communities, improvingthe power-conversion efficiency (PCE) of SC keeps tobe a long-term objective. In the past decades, enormous effortshave been paid on exploring various new structural scenariosor PV mechanisms (e.g., near-field thermophotovoltaicand hot-carrier SCs) in order to approach or even break theShockley-Queisser (SQ) efficiency limits of various SCs[1].展开更多
基金financially supported by the National Key R&D Program of China (2022YFB4200304)the National Natural Science Foundation of China (52303347)+3 种基金the Fundamental Research Funds for the Central Universities (YJ2021157)the Engineering Featured Team Fund of Sichuan University (2020SCUNG102)open foundation of Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, Guangxi University (2022GXYSOF05)the support from the National Natural Science Foundation of China (E30853YM19)
文摘Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices stability.However,the strategies of suppressing photoinduced phase segregation and related mechanisms have not been fully disclosed.Here,we report a new passivation agent 4-aminotetrahydrothiopyran hydrochloride(4-ATpHCl)with multifunctional groups for the interface treatment of a 1.77-eV wide-bandgap perovskite film.4-ATpH^(+)impeded halogen ion migration by anchoring on the perovskite surface,leading to the inhibition of phase segregation and thus the passivation of defects,which is ascribed to the interaction of 4-ATpH^(+)with perovskite and the formation of low-dimensional perovskites.Finally,the champion device achieved an efficiency of 19.32%with an open-circuit voltage(V_(OC))of 1.314 V and a fill factor of 83.32%.Moreover,4-ATpHCl modified device exhibited significant improved stability as compared with control one.The target device maintained 80%of its initial efficiency after 519 h of maximum power output(MPP)tracking under 1 sun illumination,however,the control device showed a rapid decrease in efficiency after 267 h.Finally,an efficiency of 27.38%of the champion 4-terminal all-perovskite tandem solar cell was achieved by mechanically stacking this wide-bandgap top subcell with a 1.25-eV low-bandgap perovskite bottom subcell.
文摘The solar cells (SCs) are the most typical devices used toconvert the solar energy into electricity to help relieving the energyshortage crisis. In the photovoltaic (PV) communities, improvingthe power-conversion efficiency (PCE) of SC keeps tobe a long-term objective. In the past decades, enormous effortshave been paid on exploring various new structural scenariosor PV mechanisms (e.g., near-field thermophotovoltaicand hot-carrier SCs) in order to approach or even break theShockley-Queisser (SQ) efficiency limits of various SCs[1].
