TY - JOUR AU - Ren, Guanhua AU - Han, Wenbin AU - Zhang, Qiang AU - Li, Zhuowei AU - Deng, Yanyu AU - Liu, Chunyu AU - Guo, Wenbin PY - 2022/08/23 Y2 - 2024/03/28 TI - Overcoming Perovskite Corrosion and De-Doping Through Chemical Binding of Halogen Bonds Toward Efficient and Stable Perovskite Solar Cells JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 14 IS - SE - Articles DO - 10.1007/s40820-022-00916-3 UR - https://nmlett.org/index.php/nml/article/view/1170 SP - 175 AB - <p>4-tert-butylpyridine (TBP) is an indispensable additive for the hole transport layer in highly efficient perovskite solar cells (PSCs), while it can induce corrosion decomposition of perovskites and de-doping effect of spiro-OMeTAD, which present huge challenge for the stability of PSCs. Herein, halogen bonds provided by 1,4-diiodotetrafluorobenzene (1,4-DITFB) are employed to bond with TBP, simultaneously preventing perovskite decomposition and eliminating de-doping effect of oxidized spiro-OMeTAD. Various characterizations have proved strong chemical interaction forms between 1,4-DITFB and TBP. With the incorporation of halogen bonds, perovskite film can maintain initial morphology, crystal structure, and light absorbance; meanwhile, the spiro-OMeTAD film shows a relatively stable conductivity with good charge transport property. Accordingly, the device with TBP complex exhibits significantly enhanced stability in N<sub>2</sub> atmosphere or humidity environment. Furthermore, a champion power conversion efficiency of 23.03% is obtained since perovskite is no longer damaged by TBP during device preparation. This strategy overcomes the shortcomings of TBP in n-i-p PSCs community and enhances the application potential of spiro-OMeTAD in fabricating efficient and stable PSCs.</p><p>Highlights:</p><p>1 Chemical binding of 4-tert-butylpyridine (TBP) is realized through halogen bonds.<br>2 TBP-induced perovskite decomposition and spiro-OMeTAD de-doping are suppressed.<br>3 Modified perovskite solar cells achieve greatly improved efficiency and stability.</p> ER -