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Room-temperature sputtered-SnO_(2) modified anode toward efficient TiO_(2)-based planar perovskite solar cells

Science China(Technological Sciences) 2021年第9期64卷 1995-2002页

作者： LI Dan LI Yong LIU ZhiKe WANG DaPeng LIU ShengZhong(Frank) Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China

It is of the utmost importance to promote the charge transport and retard the heterojunction barrier in the functional layers and at their adjacent interfaces to pursuit excellent photovoltaic characteristics of the perovskite solar cells(pscs). Here, roomtemperature sputtered-SnO_(2) films are introduced to modify FTO anode for improving carrier extraction and aligning energy band in the TiO_(2)-based planar pscs. For the SnO_(2)-modified substrate with suitable sputtering duration, the following TiO_(2) film exhibits smoother surface roughness, less surface defects, and lower the trap-assisted interfacial recombination than that directly on the FTO, further facilitating the growth of perovskite grain size and promoting the extraction efficiency of charge carriers. On the basis of the optimized SnO_(2)(6 nm)/TiO_(2) stack layer as electron transport layer(ETL), the psc exhibits an outstanding power conversion efficiency of 21.45%, which is much better than that of the single TiO_(2)-based device(19.68%). More importantly, the cell with the bilayer ETL shows a long-term stability against air, maintaining over 76% of its initial efficiency after 40 d. These achievements suggest that this study provides a feasible path to design energy level alignment and low temperature ETL for highly efficient and stable pscs.

关键词： sputtered-SnO_(2) anode modification bilayer ETL TiO_(2) psc device

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