Huang Like, Wang Jiahao, Zhu Yuejin
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang 315211, China.
School of Information Engineering, College of Science and Technology, Ningbo University, Ningbo 315300, China.
J Phys Chem Lett. 2021 Mar 11;12(9):2266-2272. doi: 10.1021/acs.jpclett.1c00417. Epub 2021 Feb 28.
We report an electron transport layer-free perovskite solar cell (PSC) without interface engineering, whose key is a p-n heterojunction consisting of ITO/n-type FACsPbICl/p-type spiro-MeOTAD/Ag. The naturally matched energy levels between FACsPbICl and ITO make interface engineering unnecessary. The FACsPbICl film has a wide antisolvent processing window, favoring large-area production. The self-seeding growth method regulates the energy levels and work function of the FACsPbICl film via modulating the shape and distribution of residual PbI. Interface band bending is confirmed by double-side photoluminescence (PL) measurement. Reduced PL is introduced for unambiguous charge transfer analysis without interference caused by different absorbance. Accordingly, enhanced ITO/perovskite interface energy level alignment and device performance (efficiency of 17.48% and of 1.02 V) are demonstrated. Such simplified but efficient PSCs featuring a wide antisolvent processing window have great potential in practical applications.
我们报道了一种无需界面工程的无电子传输层钙钛矿太阳能电池（PSC），其关键在于由ITO/n型FACsPbICl/p型螺环-MeOTAD/Ag组成的p-n异质结。FACsPbICl与ITO之间自然匹配的能级使得无需进行界面工程。FACsPbICl薄膜具有较宽的反溶剂处理窗口，有利于大面积生产。自种子生长方法通过调节残余PbI的形状和分布来调控FACsPbICl薄膜的能级和功函数。通过双面光致发光（PL）测量证实了界面能带弯曲。引入降低的PL用于明确的电荷转移分析，而不会因不同的吸光度产生干扰。因此，展示了增强的ITO/钙钛矿界面能级对准和器件性能（效率为17.48%，开路电压为1.02 V）。这种具有宽反溶剂处理窗口的简化但高效的PSC在实际应用中具有巨大潜力。
