With superior photoluminescence quantum yields(PLQYs),tunable bandgap,high color purity and solution pro-cessibility[1,2],metal halide perovskite nanocrystals(PNCs)with a general formula of ABX_(3)(A=CH_(3)NH_(3)+(MA+...With superior photoluminescence quantum yields(PLQYs),tunable bandgap,high color purity and solution pro-cessibility[1,2],metal halide perovskite nanocrystals(PNCs)with a general formula of ABX_(3)(A=CH_(3)NH_(3)+(MA+),CH(NH_(2))_(2)^(+)(FA^(+))and Cs^(+),B=Pb^(2+),Sn^(2+)and Mn^(2+),X=Cl-,Br-and I-)emerge as promising luminescent materials in light-emitting diodes(LEDs)and solid-state lighting[2−4].Since elec-troluminescence(EL)of PNCs was first observed in CsPbBr3 PNC-based LEDs with an external quantum efficiency(EQE)of 0.07%in 2015[5],the efficiencies for different LEDs have been significantly boosted.展开更多
Colloidal quantum dot(CQD)shows great potential for application in infrared solar cells due to the simple synthesis techniques,tunable infrared absorption spectrum,and high stability and solution-processability.Thanks...Colloidal quantum dot(CQD)shows great potential for application in infrared solar cells due to the simple synthesis techniques,tunable infrared absorption spectrum,and high stability and solution-processability.Thanks to significant efforts made on the surface chemistry of CQDs,device structure optimization,and device physics of CQD solar cells(CQDSCs),remarkable breakthroughs are achieved to boost the infrared photovoltaic performance and stability of CQDSCs.In particular,the CQDSC with a high power conversion efficiency of~14%and good stability is reported,which is very promising for infrared-absorbing solar cells.In this review,we highlight the unique optoelectronic properties of CQDs for the development of infrared-absorbing solar cells.Meanwhile,the latest advances in finely controlling surface properties of CQDs are comprehensively summarized and discussed.Moreover,the device operation of CQDSCs is discussed in-depth to highlight the impact of the device structure optimization of CQDSCs on their photovoltaic performance,and the emerging novel types of CQDSCs,such as semitransparent,flexible,and lightweight CQDSCs,are also demonstrated.The device stability of CQDSCs is also highlighted from the viewpoint of practical applications.Finally,the conclusions and possible challenges and opportunities are presented to promote the development steps of the CQDSCs with higher infrared photovoltaic performance and robust stability.展开更多
Formamidinium lead triiodide(FAPbI_(3))perovskite quantum dots(PQDs)show great advantages in photovoltaic applications due to their ideal bandgap energy,high stability and solution processability.The anti-solvent used...Formamidinium lead triiodide(FAPbI_(3))perovskite quantum dots(PQDs)show great advantages in photovoltaic applications due to their ideal bandgap energy,high stability and solution processability.The anti-solvent used for the post-treatment of FAPbI_(3) PQD solid flms signifcantly afects the surface chemistry of the PQDs,and thus the vacancies caused by surface ligand removal inhibit the optoelectronic properties and stability of PQDs.Here,we study the efects of diferent anti-solvents with diferent polarities on FAPbI_(3) PQDs and select a series of organic molecules for surface passivation of PQDs.The results show that methyl acetate could efectively remove surface ligands from the PQD surface without destroying its crystal structure during the post-treatment.The benzamidine hydrochloride(PhFACl)applied as short ligands of PQDs during the post-treatment could fll the A-site and X-site vacancies of PQDs and thus improve the electronic coupling of PQDs.Finally,the PhFACl-based PQD solar cell(PQDSC)achieves a power conversion efciency of 6.4%,compared to that of 4.63%for the conventional PQDSC.This work provides a reference for insights into the surface passivation of PQDs and the improvement in device performance of PQDSCs.展开更多
基金the National Natural Science Foundation of China(51872014)the Recruitment Program for Global Experts,the Fundamental Research Funds for the Central Universities and the“111”project(B17002)+2 种基金Songshan Lake Materials Laboratory(2021SLABFK02)the National Key Research and Development Program of China(2017YFA0206600)the National Natural Science Foundation of China(51922032,21961160720).
文摘With superior photoluminescence quantum yields(PLQYs),tunable bandgap,high color purity and solution pro-cessibility[1,2],metal halide perovskite nanocrystals(PNCs)with a general formula of ABX_(3)(A=CH_(3)NH_(3)+(MA+),CH(NH_(2))_(2)^(+)(FA^(+))and Cs^(+),B=Pb^(2+),Sn^(2+)and Mn^(2+),X=Cl-,Br-and I-)emerge as promising luminescent materials in light-emitting diodes(LEDs)and solid-state lighting[2−4].Since elec-troluminescence(EL)of PNCs was first observed in CsPbBr3 PNC-based LEDs with an external quantum efficiency(EQE)of 0.07%in 2015[5],the efficiencies for different LEDs have been significantly boosted.
基金the National Key Research and Development Program of China(No.2022YFB3807200)the National Natural Science Foundation of China(Nos.52372169 and 51872014)the Recruitment Program of Global Experts,and the“111”project(No.B17002).
文摘Colloidal quantum dot(CQD)shows great potential for application in infrared solar cells due to the simple synthesis techniques,tunable infrared absorption spectrum,and high stability and solution-processability.Thanks to significant efforts made on the surface chemistry of CQDs,device structure optimization,and device physics of CQD solar cells(CQDSCs),remarkable breakthroughs are achieved to boost the infrared photovoltaic performance and stability of CQDSCs.In particular,the CQDSC with a high power conversion efficiency of~14%and good stability is reported,which is very promising for infrared-absorbing solar cells.In this review,we highlight the unique optoelectronic properties of CQDs for the development of infrared-absorbing solar cells.Meanwhile,the latest advances in finely controlling surface properties of CQDs are comprehensively summarized and discussed.Moreover,the device operation of CQDSCs is discussed in-depth to highlight the impact of the device structure optimization of CQDSCs on their photovoltaic performance,and the emerging novel types of CQDSCs,such as semitransparent,flexible,and lightweight CQDSCs,are also demonstrated.The device stability of CQDSCs is also highlighted from the viewpoint of practical applications.Finally,the conclusions and possible challenges and opportunities are presented to promote the development steps of the CQDSCs with higher infrared photovoltaic performance and robust stability.
基金supported by the National Natural Science Foundation of China(Grant No.51872014)the Recruitment Program of Global Experts,Fundamental Research Funds for the Central Universities and the“111”project(B17002).
文摘Formamidinium lead triiodide(FAPbI_(3))perovskite quantum dots(PQDs)show great advantages in photovoltaic applications due to their ideal bandgap energy,high stability and solution processability.The anti-solvent used for the post-treatment of FAPbI_(3) PQD solid flms signifcantly afects the surface chemistry of the PQDs,and thus the vacancies caused by surface ligand removal inhibit the optoelectronic properties and stability of PQDs.Here,we study the efects of diferent anti-solvents with diferent polarities on FAPbI_(3) PQDs and select a series of organic molecules for surface passivation of PQDs.The results show that methyl acetate could efectively remove surface ligands from the PQD surface without destroying its crystal structure during the post-treatment.The benzamidine hydrochloride(PhFACl)applied as short ligands of PQDs during the post-treatment could fll the A-site and X-site vacancies of PQDs and thus improve the electronic coupling of PQDs.Finally,the PhFACl-based PQD solar cell(PQDSC)achieves a power conversion efciency of 6.4%,compared to that of 4.63%for the conventional PQDSC.This work provides a reference for insights into the surface passivation of PQDs and the improvement in device performance of PQDSCs.
