Molecular ordering within the photoactive layer plays a crucial role in determining the device performance of organic solar cells(OSCs).However,the simultaneous molecular ordering processes of polymer donors and non-f...Molecular ordering within the photoactive layer plays a crucial role in determining the device performance of organic solar cells(OSCs).However,the simultaneous molecular ordering processes of polymer donors and non-fullerene acceptors(NFAs)during solution casting usually bring confinement effect,leading to insufficient structural order of photovoltaic components.Herein,the molecular packing of mINPOIC NFA is effectively formed through a heating induced aggregation strategy,with the aggregation of PBDB-T,which has a strong temperature dependence,is retarded by casting on a preheated substrate to reduce its interference toward m-INPOIC.A sequent thermal annealing treatment is then applied to promote the ordering of PBDB-T and achieve balanced aggregation of both donors and acceptors,resulting in the achievement of a maximum efficiency of 13.9% of PBDB-T:m-INPOIC binary OSCs.This work disentangles the interactions of donor polymer and NFA during the solution casting process and develops a rational strategy to enhance the molecular packing of NFAs to boost device performance.展开更多
虽然钙钛矿太阳能电池效率的发展令人鼓舞,但是由于光反射造成的器件基底界面的光子损失等问题仍然没有解决.光管理是降低反射损失并提高器件效率的有效途径.因此,我们设计了双层减反膜以涂敷在(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x)钙钛...虽然钙钛矿太阳能电池效率的发展令人鼓舞,但是由于光反射造成的器件基底界面的光子损失等问题仍然没有解决.光管理是降低反射损失并提高器件效率的有效途径.因此,我们设计了双层减反膜以涂敷在(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x)钙钛矿太阳能电池的玻璃基底外侧,以期达到增加光吸收和提高器件效率的目的.该研究中的减反膜底层由硅聚合物构成,上层由氟代硅聚合物和六甲基二硅氧烷/介孔二氧化硅纳米粒子复合而成.通过精确调控上下层的折射率及厚度,我们在宽波段范围内实现了玻璃基底透过率从最高约90%显著提升到95%.在电池器件的玻璃基底外侧溶液涂膜制备减反膜后,(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x)钙钛矿太阳能电池在保持填充因子和开路电压不变的情况下,短路电流和效率分别从25.5 mA cm^(-2)和22.7%提高到26.5 mA cm^(-2)和23.9%.本研究提出了一种简单、高效的通过双层减反膜的光管理提高太阳能电池效率的方法,且此方法可拓展到其他类型太阳能电池体系.展开更多
Optimizing the components and morphology within the photoactive layer of organic solar cells(OSCs)can significantly enhance their power conversion efficiency(PCE).A new A-D-A type non-fullerene acceptor IDMIC-4F is de...Optimizing the components and morphology within the photoactive layer of organic solar cells(OSCs)can significantly enhance their power conversion efficiency(PCE).A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work,and is employed as the third component to prepare high performance ternary solar cells.IDMIC-4F can form fibrils after solution casting,and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains,as well as acting as transport channels to enhance electron mobility.Single junction ternary devices incorporating 10 wt%IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility,and achieve a maximum PCE of 16.6%compared to 15.7%for the binary device,which is a remarkable efficiency for OSCs reported in literature.This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.展开更多
基金supported by the Natural Science Foundation of Hubei Province(Grant No.2018CFA055)of Chinathe National Natural Science Foundation of China(Grant No.21774097)the ACAP fellowship supported by the Australian government through the Australian Renewable Energy Agency(ARENA)。
文摘Molecular ordering within the photoactive layer plays a crucial role in determining the device performance of organic solar cells(OSCs).However,the simultaneous molecular ordering processes of polymer donors and non-fullerene acceptors(NFAs)during solution casting usually bring confinement effect,leading to insufficient structural order of photovoltaic components.Herein,the molecular packing of mINPOIC NFA is effectively formed through a heating induced aggregation strategy,with the aggregation of PBDB-T,which has a strong temperature dependence,is retarded by casting on a preheated substrate to reduce its interference toward m-INPOIC.A sequent thermal annealing treatment is then applied to promote the ordering of PBDB-T and achieve balanced aggregation of both donors and acceptors,resulting in the achievement of a maximum efficiency of 13.9% of PBDB-T:m-INPOIC binary OSCs.This work disentangles the interactions of donor polymer and NFA during the solution casting process and develops a rational strategy to enhance the molecular packing of NFAs to boost device performance.
基金the Natural Science Foundation of Hubei Province(2019CFB575)the National Natural Science Foundation of China(51861145101)。
文摘虽然钙钛矿太阳能电池效率的发展令人鼓舞,但是由于光反射造成的器件基底界面的光子损失等问题仍然没有解决.光管理是降低反射损失并提高器件效率的有效途径.因此,我们设计了双层减反膜以涂敷在(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x)钙钛矿太阳能电池的玻璃基底外侧,以期达到增加光吸收和提高器件效率的目的.该研究中的减反膜底层由硅聚合物构成,上层由氟代硅聚合物和六甲基二硅氧烷/介孔二氧化硅纳米粒子复合而成.通过精确调控上下层的折射率及厚度,我们在宽波段范围内实现了玻璃基底透过率从最高约90%显著提升到95%.在电池器件的玻璃基底外侧溶液涂膜制备减反膜后,(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x)钙钛矿太阳能电池在保持填充因子和开路电压不变的情况下,短路电流和效率分别从25.5 mA cm^(-2)和22.7%提高到26.5 mA cm^(-2)和23.9%.本研究提出了一种简单、高效的通过双层减反膜的光管理提高太阳能电池效率的方法,且此方法可拓展到其他类型太阳能电池体系.
基金supported by the Natural Science Foundation of Hubei Province of China(2018CFA055)the National Natural Science Foundation of China(21774097)the 111 project(B18038)。
文摘Optimizing the components and morphology within the photoactive layer of organic solar cells(OSCs)can significantly enhance their power conversion efficiency(PCE).A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work,and is employed as the third component to prepare high performance ternary solar cells.IDMIC-4F can form fibrils after solution casting,and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains,as well as acting as transport channels to enhance electron mobility.Single junction ternary devices incorporating 10 wt%IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility,and achieve a maximum PCE of 16.6%compared to 15.7%for the binary device,which is a remarkable efficiency for OSCs reported in literature.This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.
