It has been widely recognized that hole transporting materials(HTMs)play a key role in the rapid progress of perovskite solar cells(PVSCs).However,common organic HTMs such as spiro-OMe TAD not only suffer from high sy...It has been widely recognized that hole transporting materials(HTMs)play a key role in the rapid progress of perovskite solar cells(PVSCs).However,common organic HTMs such as spiro-OMe TAD not only suffer from high synthetic costs,but also usually require the additional chemical doping process to improve their hole transport ability,which unfortunately induces the terrible stability issue.Therefore,it is urgent to develop low-cost dopant-free HTMs for efficient and stable PVSCs.In this work,we have successfully developed a new class of efficient dopant-free fluoranthene-based HTMs(TPF1–5)with quite low lab synthetic costs by combining donor-acceptor and branched structure designs.The detailed structure-property study revealed that tuning the twisted arms at different substitution sites would regulate the intermolecular interactions and film-forming ability,thereby significantly affecting the performance of the HTMs.By applying these HTMs in conventional PVSCs,the dopant-free TPF1-based devices not only achieved the best efficiency of 21.76%,which is comparable to that of the doped spiro-OMeTAD control devices,but also showed much better operational stability,which maintained over 87%of the initial efficiency under maximum power point tracking after 1038 h.展开更多
Cesium-based inorganic perovskite solar cells(PSCs)are paid more attention because of their potential thermal stability.However,prevalent salt-doped 2,2',7,7'-tetrakis(N,N-dipmethoxyphenylamine)9,9z-spirobiflu...Cesium-based inorganic perovskite solar cells(PSCs)are paid more attention because of their potential thermal stability.However,prevalent salt-doped 2,2',7,7'-tetrakis(N,N-dipmethoxyphenylamine)9,9z-spirobifluorene(Spiro-OMeTAD)as hole-transport materials(HTMs)for a high-efficiency inorganic device has an unfortunate defective thermal stability.In this study,we apply poly(3-hexylthiophene-2,5-diyl)(P3HT)as the HTM and design all-inorganic PSCs with an indium tin oxide(ITO)/SnO2/LiF/CsPbI3-xBrx/P3HT/Au structure.As a result,the CsPbb-xBrx PSCs achieve an excellent performance of 15.84%.The P3HT HTM-based device exhibits good photo-stability,maintaining〜80%of their initial power conversion efficiency over 280 h under one Sun irradiation.In addition,they also show better thermal stability compared with the traditional HTM Spiro-OMeTAD.展开更多
基金supported by National Key Research&Development Program of China(No.2023YFE0210900)National Natural Science Foundation of China(No.21975085)+1 种基金Excellent Youth Foundation of Hubei Scientific Committee(No.2021CFA065)open Fund of Hubei Key Laboratory of Material Chemistry and Service Failure(No.2023MCF02)。
文摘It has been widely recognized that hole transporting materials(HTMs)play a key role in the rapid progress of perovskite solar cells(PVSCs).However,common organic HTMs such as spiro-OMe TAD not only suffer from high synthetic costs,but also usually require the additional chemical doping process to improve their hole transport ability,which unfortunately induces the terrible stability issue.Therefore,it is urgent to develop low-cost dopant-free HTMs for efficient and stable PVSCs.In this work,we have successfully developed a new class of efficient dopant-free fluoranthene-based HTMs(TPF1–5)with quite low lab synthetic costs by combining donor-acceptor and branched structure designs.The detailed structure-property study revealed that tuning the twisted arms at different substitution sites would regulate the intermolecular interactions and film-forming ability,thereby significantly affecting the performance of the HTMs.By applying these HTMs in conventional PVSCs,the dopant-free TPF1-based devices not only achieved the best efficiency of 21.76%,which is comparable to that of the doped spiro-OMeTAD control devices,but also showed much better operational stability,which maintained over 87%of the initial efficiency under maximum power point tracking after 1038 h.
基金supported by the Beijing Municipal Science and Technology Commission(Nos.Z181100004718005 and Z181100005118002).
文摘Cesium-based inorganic perovskite solar cells(PSCs)are paid more attention because of their potential thermal stability.However,prevalent salt-doped 2,2',7,7'-tetrakis(N,N-dipmethoxyphenylamine)9,9z-spirobifluorene(Spiro-OMeTAD)as hole-transport materials(HTMs)for a high-efficiency inorganic device has an unfortunate defective thermal stability.In this study,we apply poly(3-hexylthiophene-2,5-diyl)(P3HT)as the HTM and design all-inorganic PSCs with an indium tin oxide(ITO)/SnO2/LiF/CsPbI3-xBrx/P3HT/Au structure.As a result,the CsPbb-xBrx PSCs achieve an excellent performance of 15.84%.The P3HT HTM-based device exhibits good photo-stability,maintaining〜80%of their initial power conversion efficiency over 280 h under one Sun irradiation.In addition,they also show better thermal stability compared with the traditional HTM Spiro-OMeTAD.
