Coper thiocyanate(CuSCN)is generally considered as a very hopeful inorganic hole transport material(HTM)in semitransparent perovskite solar cells(ST-PSCs)because of its low parasitic absorption,high inherent stability...Coper thiocyanate(CuSCN)is generally considered as a very hopeful inorganic hole transport material(HTM)in semitransparent perovskite solar cells(ST-PSCs)because of its low parasitic absorption,high inherent stability,and low cost.However,the poor electrical conductivity and low work function of CuSCN lead to the insufficient hole extraction and large open-circuit voltage loss.Here,2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)is employed to improve conductivity of CuSCN and band alignment at the CuSCN/perovskite(PVK)interface.As a result,the average power conversion efficiency(PCE)of PSCs is boosted by≈11%.In addition,benefiting from the superior transparency of p-type CuSCN HTMs,the prepared bifacial semitransparent n-i-p planar PSCs demonstrate a maximum efficiency of 14.8%and 12.5%by the illumination from the front side and back side,respectively.We believe that this developed CuSCN-based ST-PSCs will promote practical applications in building integrated photovoltaics and tandem solar cells.展开更多
Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparenc...Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparency and excellent electrical properties are essential for optimized hole transport materials in inverted-type planar perovskite solar cells.In this study,we demonstrate that the molecular doping of copper thiocyanate(CuSCN)by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)significantly enhances the photovoltaic performance of perovskite solar cells.The incorporation of F4TCNQ into CuSCN leads to successful electron transfer from CuSCN to F4TCNQ,which affords more balanced energy level alignment at the interface of the perovskite layer for hole conduction.Device analyses reveal faster charge transport and less carrier recombination in the F4TCNQ-doped CuSCN-based devices,contributing to not only the improved efficiency but also the hysteresis elimination.At the optimized doping concentration,the doped CuSCN exhibited an∼35%increased efficiency as high as 15.01%in the inverted-type planar perovskite solar cells.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2018YFB1500103)the National Natural Science Foundation of China(Grant No.61674084)+1 种基金the Overseas Expertise Introduction Project for Discipline Innovation of Higher Education of China(Grant No.B16027)the Science and Technology Project of Tianjin,China(Grant No.18ZXJMTG00220).
文摘Coper thiocyanate(CuSCN)is generally considered as a very hopeful inorganic hole transport material(HTM)in semitransparent perovskite solar cells(ST-PSCs)because of its low parasitic absorption,high inherent stability,and low cost.However,the poor electrical conductivity and low work function of CuSCN lead to the insufficient hole extraction and large open-circuit voltage loss.Here,2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)is employed to improve conductivity of CuSCN and band alignment at the CuSCN/perovskite(PVK)interface.As a result,the average power conversion efficiency(PCE)of PSCs is boosted by≈11%.In addition,benefiting from the superior transparency of p-type CuSCN HTMs,the prepared bifacial semitransparent n-i-p planar PSCs demonstrate a maximum efficiency of 14.8%and 12.5%by the illumination from the front side and back side,respectively.We believe that this developed CuSCN-based ST-PSCs will promote practical applications in building integrated photovoltaics and tandem solar cells.
基金supported by Korea Electric Power Corporation(Grant number:R17XA05-11)This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT&Future Planning(Grant number:2017R1C1B2009691).
文摘Among many strategies to develop high-performance perovskite solar cells,interface engineering is considered as a promising approach for achieving high power conversion efficiency.Specifically,high optical transparency and excellent electrical properties are essential for optimized hole transport materials in inverted-type planar perovskite solar cells.In this study,we demonstrate that the molecular doping of copper thiocyanate(CuSCN)by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)significantly enhances the photovoltaic performance of perovskite solar cells.The incorporation of F4TCNQ into CuSCN leads to successful electron transfer from CuSCN to F4TCNQ,which affords more balanced energy level alignment at the interface of the perovskite layer for hole conduction.Device analyses reveal faster charge transport and less carrier recombination in the F4TCNQ-doped CuSCN-based devices,contributing to not only the improved efficiency but also the hysteresis elimination.At the optimized doping concentration,the doped CuSCN exhibited an∼35%increased efficiency as high as 15.01%in the inverted-type planar perovskite solar cells.
