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Insight into the CH_3NH_3PbI_3/C interface in hole-conductor-free mesoscopic perovskite solar cells

Jiangwei Li  Guangda Niu  Wenzhe Li  Kun Cao  Mingkui Wang  Liduo Wang  
【摘要】:Perovskite solar cells(PSCs) with hole-conductor-free mesoscopic architecture have shown superb stability and great potential in practical application.The printable carbon counter electrodes take full responsibility of extracting holes from the active CH_3NH_3PbI_3 absorbers.However,an in depth study of the CH_3NH_3PbI_3/C interface properties,such as the structural formation process and the effect of interfacial condition on hole extraction,is still lacking.Herein,we present,for the first time,an insight of the spatial confinement induced CH_3NH_3Pb I_3/C interface formation by in-situ photoluminescence observation during the crystallization process of CH3NH3 Pb I3.The derived reaction kinetics allows to a quantitative description of the perovskite formation process.In addition,we found the interfacial contact between carbon and perovskite to be dominant for hole extraction efficiency,being associated with the photovoltaic parameter of short circuit current density(JSC).Consequently,we conducted a solvent vapor assisted process of PbI_2 diffusion to carefully control the CH_3NH_3PbI_3/C interface with less unreacted PbI_2 barrier.The improvement of interface condition therefore contributes to a high hole extraction proved by charge extraction resistance and PL lifetime change,resulting in the increased J_(SC).

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