The limited charge extraction efficiency and suboptimal energy-level alignment of poly(3,4-ethylenediox ythiophene)polystyrene sulfonate(PEDOT:PSS)as a hole transport layer restrict its performance in solar cell appli...The limited charge extraction efficiency and suboptimal energy-level alignment of poly(3,4-ethylenediox ythiophene)polystyrene sulfonate(PEDOT:PSS)as a hole transport layer restrict its performance in solar cell applications.In this study,we developed effective copper-ion(Cu(Ⅱ))-modified oxyl-terminated melem two-dimensional(2D)nanodisks(Cu(Ⅱ)@OMN)that improved the performance of PEDOT:PSS as a representative hole-transport layer(HTL)in organic and perovskite solar cells.Based on theoretical calculations and experimental data,the interaction between Cu(Ⅱ)@OMN and PEDOT or PSS led to electron redistribution in PEDOT:PSS and the dissociation of PEDOT and PSS,promoting enhanced charge extraction and transfer.In addition,the work function of the Cu(Ⅱ)@OMN-PEDOT:PSS is modified to achieve a more beneficial energy-level alignment,thereby facilitating improved hole transport and inhibited nonradiative recombination.Methylammonium(MA)-based perovskite and organic binary PM6:Y6solar cells achieved power conversion efficiencies(PCEs)of 19.21% and 17.15%,respectively.These PCEs are among the highest reported for MA-based perovskite and binary PM6:Y6 organic solar cells that use 2D nanomaterial-modified PEDOT:PSS,demonstrating the potential of Cu(Ⅱ)@OMN in solar cell applications.展开更多
Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au（111） interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH 〉 pKbl of melem, two orde...Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au（111） interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH 〉 pKbl of melem, two ordered self-assembled structures （honeycomb and close-packed structures） and one disordered fibrillar structure were observed as a function of the surface coverage ofmelem controlled by the electrode potential. In contrast, in the acidic solution with pH 〈 pKbl of melem, only the self-assembled honeycomb network was observed in a relatively wide potential range probably due to the presence of monoprotonated melem cations. Dots attrib- uted to counteranions were frequently observed in the pores of the honeycomb network. The lack of close-packed and fibrillar structures at low pH （ 〈 pKbl） is attributed to ionic repulsion of melemium cations.展开更多
基金supported by the Nano Material Technology Development Program(2021M3H4A1A02057007)funded by the Ministry of Science and ICT through the National Research Foundation of Koreasupported by the Basic Science Research Program through NRF funded by the Ministry of Education(2022R1A6A1A03051158,2022R1A2C4002248,RS-202300247069)。
文摘The limited charge extraction efficiency and suboptimal energy-level alignment of poly(3,4-ethylenediox ythiophene)polystyrene sulfonate(PEDOT:PSS)as a hole transport layer restrict its performance in solar cell applications.In this study,we developed effective copper-ion(Cu(Ⅱ))-modified oxyl-terminated melem two-dimensional(2D)nanodisks(Cu(Ⅱ)@OMN)that improved the performance of PEDOT:PSS as a representative hole-transport layer(HTL)in organic and perovskite solar cells.Based on theoretical calculations and experimental data,the interaction between Cu(Ⅱ)@OMN and PEDOT or PSS led to electron redistribution in PEDOT:PSS and the dissociation of PEDOT and PSS,promoting enhanced charge extraction and transfer.In addition,the work function of the Cu(Ⅱ)@OMN-PEDOT:PSS is modified to achieve a more beneficial energy-level alignment,thereby facilitating improved hole transport and inhibited nonradiative recombination.Methylammonium(MA)-based perovskite and organic binary PM6:Y6solar cells achieved power conversion efficiencies(PCEs)of 19.21% and 17.15%,respectively.These PCEs are among the highest reported for MA-based perovskite and binary PM6:Y6 organic solar cells that use 2D nanomaterial-modified PEDOT:PSS,demonstrating the potential of Cu(Ⅱ)@OMN in solar cell applications.
基金This work was supported by a Grant-in-Aid for Young Scientists （A） （23681016） from the Ministry of Education, Culture, Sports, Science and Technology （MEXT）, Japan, and partly by the Hayashi Memorial Foundation for Female Natural Scientists and Technology Agency and the Tokuyama Science Foundation.
文摘Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au（111） interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH 〉 pKbl of melem, two ordered self-assembled structures （honeycomb and close-packed structures） and one disordered fibrillar structure were observed as a function of the surface coverage ofmelem controlled by the electrode potential. In contrast, in the acidic solution with pH 〈 pKbl of melem, only the self-assembled honeycomb network was observed in a relatively wide potential range probably due to the presence of monoprotonated melem cations. Dots attrib- uted to counteranions were frequently observed in the pores of the honeycomb network. The lack of close-packed and fibrillar structures at low pH （ 〈 pKbl） is attributed to ionic repulsion of melemium cations.
