Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the ed...Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the edge surface of Si solar cells affects their efficiency and stability.Herein,we design a multi-site passivation agent to simultaneously suppress defect recombination in hole transfer layer(HTL)surface,perovskite buried interface,and Si edge for efficient tandem solar cells.The increased ratio of Ni^(3+)/Ni^(2+)reduces the nickel oxide(NiO_(x))/perovskite interface reaction and improves the conductivity of the NiO_(x) HTL.The reconstructed underlayer is more propitious to the perovskite deposition,which releases the residual strain,resulting in the enhancement of the efficiency and stability of PSCs.Moreover,the multi-site passivation agent presents a distinctive passivation effect for edge surface of Si solar cells.Power conversion efficiencies(PCEs)of 21.95% and 20.01% are obtained at opaque and semitransparent PSCs,respectively.Additionally,a four-terminal tandem solar cell exhibits a PCE of 31.02% with+1.19% abs PCE increase for bottom cell by edge surface passivation.Overall,this work provides a simple and multi-site surface defect passivation strategy for obtaining high-efficiency and stable perovskite and perovskite tandem solar cells.展开更多
基金the National Natural Science Foundation of China(62304066,62274054)China and Germany Postdoctoral Exchange Program(ZD2023010),Natural Science Foundation of Hebei Province(F2023201001,F2023201005)+2 种基金Interdisciplinary research project of Hebei University(DXK202303)The Central Guidance on Local Science and Technology Development Fund Project of Hebei Province(No.236Z4307G,226Z4306G)Hebei Province Department of Education Youth Fund Project(QN 2025349).
文摘Wide-band gap perovskites combined with silicon(Si)in tandem solar cells offer a cost-effective path to industrialization.However,surface recombination at the buried interface of perovskite solar cells(PSCs)and the edge surface of Si solar cells affects their efficiency and stability.Herein,we design a multi-site passivation agent to simultaneously suppress defect recombination in hole transfer layer(HTL)surface,perovskite buried interface,and Si edge for efficient tandem solar cells.The increased ratio of Ni^(3+)/Ni^(2+)reduces the nickel oxide(NiO_(x))/perovskite interface reaction and improves the conductivity of the NiO_(x) HTL.The reconstructed underlayer is more propitious to the perovskite deposition,which releases the residual strain,resulting in the enhancement of the efficiency and stability of PSCs.Moreover,the multi-site passivation agent presents a distinctive passivation effect for edge surface of Si solar cells.Power conversion efficiencies(PCEs)of 21.95% and 20.01% are obtained at opaque and semitransparent PSCs,respectively.Additionally,a four-terminal tandem solar cell exhibits a PCE of 31.02% with+1.19% abs PCE increase for bottom cell by edge surface passivation.Overall,this work provides a simple and multi-site surface defect passivation strategy for obtaining high-efficiency and stable perovskite and perovskite tandem solar cells.
