The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI_(2)Br perovskite solar cells.Surface modification has been proven to be an effective strategy to passi...The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI_(2)Br perovskite solar cells.Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI_(2)Br perovskite.However,most modifiers behave high volatility and insulation,not enough to further develop the CsPbI_(2)Br solar cells.Herein,an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride([PEVIM]Cl)is applied to modify the CsPbI_(2)Br film surface,yielding a compact film with enhanced crystallinity.The surface trap states of CsPbI_(2)Br film are effectively passivated via the interaction between carbonyl group of[PEVIM]Cl and uncoordinated metal cations of CsPbI_(2)Br perovskite,leading to charge recombination suppression and charge transport enhancement.Consequently,the power conversion efficiency(PCE)of[PEVIM]Cl modified CsPbI_(2)Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V.Moreover,the non-encapsulated device presents excellent thermal stability,still maintaining 91%PCE when heated at 85℃ in nitrogen atmosphere for 360 h.Meanwhile,the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h.This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.展开更多
Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,th...Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,the poor quality and high trap states of Sb_(2)S_(3)films limit the device performance further enhancement.Herein,we adopt a multidentate ionic liquid,tetramethylammonium hexafluorophosphate([TMA][PF_(6)])as a novel additive to address this issue.The octahedral[PF_(6)]~-contains six different oriented fluorine atoms with the lone pair electrons,which could coordinate with Sb atoms due to the multidentate anchoring.Thus,the high-quality Sb_(2)S_(3)film with low trap states has been achieved.Moreover,the Fermi level of the Sb_(2)S_(3)film has been upshifted,thereby showing an effective charge transfer.As a result,all photovoltaic parameters of the optimized Sb_(2)S_(3)devices are obviously enhanced,boosting the final PCE from 4.43(control device)to 6.83%.Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb_(2)S_(3)device performance.展开更多
Sb_(2)S_(3) is a promising photovoltaic absorber with appropriate bandgap,excellent light absorption coefficient and great stability.However,the power conversion efficiency(PCE)of Sb_(2)S_(3) planar thin film solar ce...Sb_(2)S_(3) is a promising photovoltaic absorber with appropriate bandgap,excellent light absorption coefficient and great stability.However,the power conversion efficiency(PCE)of Sb_(2)S_(3) planar thin film solar cells is unsatisfactory for further commercial application due to low crystallinity and high resistivity of Sb_(2)S_(3) film.Here,we introduce an additive of 4-Chloro-3-nitrobenzenesulfonyl Chloride(CSCl)to alleviate these problems.The CSCl molecular contains two terminal Cl with lone pair electrons,which have the interaction with Sb atoms.Thus,the Sb_(2)S_(3) film with enhanced crystallization and low trap states has been obtained and the resistivity is also decreased.Furthermore,CSCl additive raises the Fermi level of the Sb_(2)S_(3) film,thereby enhancing the transport of electron from Sb_(2)S_(3) to TiO_(2).Consequently,the optimal PCE of Sb_(2)S_(3) solar cells is raised from 4.20%(control device)to 5.84%.Our research demonstrates a novel additive to enhance the photoelectric performance of Sb_(2)S_(3) solar cells.展开更多
基金This research is supported by the Key Research and Development Program from Shaanxi Province,China(2020GXLH-Z-025)the Shaanxi International Cooperation Project,China(2020KWZ-018)the Fundamental Research Funds for the Central Universities,China(3102019ghxm003,3102019JC005,3102019ghjd001).
文摘The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI_(2)Br perovskite solar cells.Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI_(2)Br perovskite.However,most modifiers behave high volatility and insulation,not enough to further develop the CsPbI_(2)Br solar cells.Herein,an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride([PEVIM]Cl)is applied to modify the CsPbI_(2)Br film surface,yielding a compact film with enhanced crystallinity.The surface trap states of CsPbI_(2)Br film are effectively passivated via the interaction between carbonyl group of[PEVIM]Cl and uncoordinated metal cations of CsPbI_(2)Br perovskite,leading to charge recombination suppression and charge transport enhancement.Consequently,the power conversion efficiency(PCE)of[PEVIM]Cl modified CsPbI_(2)Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V.Moreover,the non-encapsulated device presents excellent thermal stability,still maintaining 91%PCE when heated at 85℃ in nitrogen atmosphere for 360 h.Meanwhile,the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h.This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.
基金financially supported by the Basic Research Fund for Free Exploration in Shenzhen(No.JCYJ20180306171402878)the National Natural Science Foundation of China(No.52072228,51571166 and 21603175)the Fundamental Research Funds for the Central Universities(No.3102019JC005)。
文摘Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,the poor quality and high trap states of Sb_(2)S_(3)films limit the device performance further enhancement.Herein,we adopt a multidentate ionic liquid,tetramethylammonium hexafluorophosphate([TMA][PF_(6)])as a novel additive to address this issue.The octahedral[PF_(6)]~-contains six different oriented fluorine atoms with the lone pair electrons,which could coordinate with Sb atoms due to the multidentate anchoring.Thus,the high-quality Sb_(2)S_(3)film with low trap states has been achieved.Moreover,the Fermi level of the Sb_(2)S_(3)film has been upshifted,thereby showing an effective charge transfer.As a result,all photovoltaic parameters of the optimized Sb_(2)S_(3)devices are obviously enhanced,boosting the final PCE from 4.43(control device)to 6.83%.Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb_(2)S_(3)device performance.
基金This research is supported by the Key Research and Development Program from Shaanxi Province,China(2020GXLH-Z-025)the Shaanxi International Cooperation Project,China(2020KWZ-018)the Fundamental Research Funds for the Central Universities,China(3102019ghxm003,3102019JC005,3102019ghjd001).
文摘Sb_(2)S_(3) is a promising photovoltaic absorber with appropriate bandgap,excellent light absorption coefficient and great stability.However,the power conversion efficiency(PCE)of Sb_(2)S_(3) planar thin film solar cells is unsatisfactory for further commercial application due to low crystallinity and high resistivity of Sb_(2)S_(3) film.Here,we introduce an additive of 4-Chloro-3-nitrobenzenesulfonyl Chloride(CSCl)to alleviate these problems.The CSCl molecular contains two terminal Cl with lone pair electrons,which have the interaction with Sb atoms.Thus,the Sb_(2)S_(3) film with enhanced crystallization and low trap states has been obtained and the resistivity is also decreased.Furthermore,CSCl additive raises the Fermi level of the Sb_(2)S_(3) film,thereby enhancing the transport of electron from Sb_(2)S_(3) to TiO_(2).Consequently,the optimal PCE of Sb_(2)S_(3) solar cells is raised from 4.20%(control device)to 5.84%.Our research demonstrates a novel additive to enhance the photoelectric performance of Sb_(2)S_(3) solar cells.