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Synergistic Effects of Cation and Anion in an Ionic Imidazolium Tetrafluoroborate Additive for Improving the Efficiency and Stability of Half‐Mixed Pb‐Sn Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-12-23 , DOI: 10.1002/adfm.202008801
Hongki Kim 1, 2 , Jong Woo Lee 3 , Gi Rim Han 4 , Seong Keun Kim 4 , Joon Hak Oh 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-12-23 , DOI: 10.1002/adfm.202008801
Hongki Kim 1, 2 , Jong Woo Lee 3 , Gi Rim Han 4 , Seong Keun Kim 4 , Joon Hak Oh 1
Affiliation
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Narrow‐bandgap mixed Pb‐Sn perovskite solar cells (PSCs) have great feasibility for constructing efficient all‐perovskite tandem solar cells, in combination with wide‐bandgap lead halide PSCs. However, the power conversion efficiency of mixed Pb‐Sn PSCs still lags behind lead‐based counterparts. Here, additive engineering using ionic imidazolium tetrafluoroborate (IMBF4) is proposed, where the imidazolium (IM) cation and tetrafluoroborate (BF4) anion efficiently passivate defects at grain boundaries and improve crystallinity, simultaneously relaxing lattice strain, respectively. Defect passivation is achieved by the chemical interaction between the IM cation and the positively charged under‐coordinated Pb2+ or Sn2+ ions, and lattice strain relaxation is realized by lattice expansion with the intercalation of BF4 anions into the perovskite lattice. As a result, the synergistic effects of the cation and anion in the IMBF4 additive greatly enhance the optoelectronic performance of half‐mixed Pb‐Sn perovskites, leading to much longer carrier lifetimes. The best‐performing half‐mixed Pb‐Sn PSC shows an efficiency above 19% with negligible hysteresis, while retaining over 90% of its initial efficiency after 1000 h in a nitrogen‐filled glovebox and showing a lifetime to 80% degradation of 53.5 h under continuous illumination.
中文翻译:
阳离子咪唑四氟硼酸盐添加剂中阳离子和阴离子的协同效应,可改善半混合Pb-Sn钙钛矿太阳能电池的效率和稳定性
窄带隙混合的Pb-Sn钙钛矿型太阳能电池(PSC)与宽带隙卤化铅PSC组合在一起,可用于构建高效的全钙钛矿串联型太阳能电池。但是,混合的Pb-Sn PSC的功率转换效率仍然落后于基于铅的PSC。在此,提出了使用离子型咪唑四氟硼酸根(IMBF 4)的添加剂工程,其中咪唑鎓(IM)阳离子和四氟硼酸根(BF 4)阴离子有效地钝化了晶界处的缺陷并提高了结晶度,同时缓解了晶格应变。缺陷钝化是通过IM阳离子与带正电的配位不足的Pb 2+或Sn 2+之间的化学相互作用实现的离子,晶格应变松弛是通过将BF 4阴离子插入钙钛矿晶格中进行晶格膨胀来实现的。结果,IMBF 4添加剂中阳离子和阴离子的协同作用大大增强了Pb-Sn半混合钙钛矿的光电性能,从而延长了载流子寿命。表现最佳的半混合Pb-Sn PSC在滞后作用可忽略不计的情况下显示出高于19%的效率,而在充氮手套箱中放置1000 h后仍保持了其初始效率的90%以上,并且在53.5 h的使用寿命内可显示80%的降解率在连续照明下。
更新日期:2020-12-23
中文翻译:
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阳离子咪唑四氟硼酸盐添加剂中阳离子和阴离子的协同效应,可改善半混合Pb-Sn钙钛矿太阳能电池的效率和稳定性
窄带隙混合的Pb-Sn钙钛矿型太阳能电池(PSC)与宽带隙卤化铅PSC组合在一起,可用于构建高效的全钙钛矿串联型太阳能电池。但是,混合的Pb-Sn PSC的功率转换效率仍然落后于基于铅的PSC。在此,提出了使用离子型咪唑四氟硼酸根(IMBF 4)的添加剂工程,其中咪唑鎓(IM)阳离子和四氟硼酸根(BF 4)阴离子有效地钝化了晶界处的缺陷并提高了结晶度,同时缓解了晶格应变。缺陷钝化是通过IM阳离子与带正电的配位不足的Pb 2+或Sn 2+之间的化学相互作用实现的离子,晶格应变松弛是通过将BF 4阴离子插入钙钛矿晶格中进行晶格膨胀来实现的。结果,IMBF 4添加剂中阳离子和阴离子的协同作用大大增强了Pb-Sn半混合钙钛矿的光电性能,从而延长了载流子寿命。表现最佳的半混合Pb-Sn PSC在滞后作用可忽略不计的情况下显示出高于19%的效率,而在充氮手套箱中放置1000 h后仍保持了其初始效率的90%以上,并且在53.5 h的使用寿命内可显示80%的降解率在连续照明下。