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001006591 1001_ $$00000-0001-6505-3232$$aYuan, Ligang$$b0
001006591 245__ $$aA conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells
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001006591 520__ $$aState-of-the-art n–i–p perovskite solar cells (PSCs) suffer from stability issues due to ionic interdiffusion. Herein, by enlarging the indacenodithiophene π-bridge donor (D′) to combine with the methoxy triphenylamine donor (D) and benzothiadiazole acceptor (A), three linear molecules termed L1, L2 and L3 with a D–A–D′–A–D structure are developed as dopant-free hole transport materials (HTMs). The π-bridge extension with active sites for coordination leverages the intramolecular dipole effect and intermolecular packing effect, resulting in a conformally bonded ultrathin interface with compact and uniform coverage (∼60 nm) to retard iodine migration and protect the buried perovskite. The unencapsulated L3-PSC (ITO/SnO2/perovskite/L3/MoO3/Au) achieved an impressive PCE of 22.61% (certified 21.79%, 0.0525 cm2). Ultrafast laser spectroscopy reveals that L-series molecules have a sequential reduction of photoexcited energy disorder to illustrate the structure–performance–stability relationship. L3-PSC maintains over 85% of the initial efficiency after 500 h at 85 °C maximum power point tracking (MPP) and enables the possibility of using small molecules to stabilize n–i–p PSCs.
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001006591 7001_ $$0P:(DE-HGF)0$$aZhu, Weiya$$b1
001006591 7001_ $$0P:(DE-HGF)0$$aZhang, Yiheng$$b2
001006591 7001_ $$00000-0002-7931-9879$$aLi, Yuan$$b3$$eCorresponding author
001006591 7001_ $$0P:(DE-HGF)0$$aChan, Christopher C. S.$$b4
001006591 7001_ $$0P:(DE-HGF)0$$aQin, Minchao$$b5
001006591 7001_ $$00000-0002-7029-1523$$aQiu, Jianhang$$b6
001006591 7001_ $$0P:(DE-HGF)0$$aZhang, Kaicheng$$b7
001006591 7001_ $$0P:(DE-HGF)0$$aHuang, Jiaxing$$b8
001006591 7001_ $$0P:(DE-HGF)0$$aWang, Jiarong$$b9
001006591 7001_ $$0P:(DE-HGF)0$$aLuo, Huiming$$b10
001006591 7001_ $$0P:(DE-HGF)0$$aZhang, Zheng$$b11
001006591 7001_ $$0P:(DE-HGF)0$$aChen, Ruipeng$$b12
001006591 7001_ $$0P:(DE-HGF)0$$aLiang, Weixuan$$b13
001006591 7001_ $$0P:(DE-HGF)0$$aWei, Qi$$b14
001006591 7001_ $$0P:(DE-HGF)0$$aWong, Kam Sing$$b15
001006591 7001_ $$0P:(DE-HGF)0$$aLu, Xinhui$$b16
001006591 7001_ $$0P:(DE-Juel1)180778$$aLi, Ning$$b17$$eCorresponding author
001006591 7001_ $$0P:(DE-Juel1)176427$$aBrabec, Christoph$$b18
001006591 7001_ $$00000-0001-6437-9150$$aDing, Liming$$b19
001006591 7001_ $$00000-0003-4380-7325$$aYan, Keyou$$b20$$eCorresponding author
001006591 773__ $$0PERI:(DE-600)2439879-2$$a10.1039/D2EE03565K$$gp. 10.1039.D2EE03565K$$n3$$p1597-1609 $$tEnergy & environmental science$$v16$$x1754-5692$$y2023
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