Saranin Danila, Gostischev Pavel, Tatarinov Dmitry, Ermanova Inga, Mazov Vsevolod, Muratov Dmitry, Tameev Alexey, Kuznetsov Denis, Didenko Sergey, Di Carlo Aldo
L.A.S.E.-Laboratory for Advanced Solar Energy, National University of Science and Technology "MISiS", Leninskiy prospect 6, Moscow 119049, Russia.
Laboratory "Electronic and photon processes in polymer nanomaterials", Russian Academy of Sciences A.N. Frumkin Institute of Physical chemistry and Electrochemistry, Leninskiy prospect 31k4, Moscow 119071, Russia.
Materials (Basel). 2019 Apr 30;12(9):1406. doi: 10.3390/ma12091406.
Nickel oxide (NiO) is one of the most promising and high-performing Hole Transporting Layer (HTL) in inverted perovskite solar cells due to ideal band alignment with perovskite absorber, wide band gap, and high mobility of charges. At the same time, however, NiO does not provide good contact and trap-free junction for hole collection. In this paper, we examine this problem by developing a double hole transport configuration with a copper iodide (CuI) interlayer for efficient surface passivation. Transient photo-current (TPC) measurements showed that Perovskite/HTL interface with CuI interlayer has an improved hole injection; CuI passivation reduces the concentration of traps and the parasitic charge accumulation that limits the flow of charges. Moreover, we found that CuI protect the HTL/perovskite interface from degradation and consequently improve the stability of the cell. The presence of CuI interlayer induces an improvement of open-circuit voltage V (from 1.02 V to 1.07 V), an increase of the shunt resistance R (100%), a reduction of the series resistance R (-30%), and finally a +10% improvement of the solar cell efficiency.
氧化镍（NiO）由于与钙钛矿吸收层具有理想的能带排列、宽带隙和高电荷迁移率，是倒置钙钛矿太阳能电池中最有前景且性能优异的空穴传输层（HTL）之一。然而，与此同时，NiO并不能为空穴收集提供良好的接触和无陷阱结。在本文中，我们通过开发一种带有碘化铜（CuI）中间层的双空穴传输结构来研究这个问题，以实现高效的表面钝化。瞬态光电流（TPC）测量表明，带有CuI中间层的钙钛矿/HTL界面具有改善的空穴注入；CuI钝化降低了陷阱浓度和限制电荷流动的寄生电荷积累。此外，我们发现CuI保护HTL/钙钛矿界面不被降解，从而提高了电池的稳定性。CuI中间层的存在使开路电压V提高（从1.02 V提高到1.07 V），并联电阻R增加（100%），串联电阻R降低（-30%），最终使太阳能电池效率提高了10%。
