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p-Doping of a Hole Transport Material via a Poly(ionic liquid) for over 20% Efficiency and Hysteresis-Free Perovskite Solar Cells
ACS Applied Energy Materials ( IF 6.4 ) Pub Date : 2020-01-14 00:00:00 , DOI: 10.1021/acsaem.9b01819
Camille Geffroy 1, 2, 3 , Eftychia Grana 1 , Takeru Bessho 3 , Samy Almosni 4 , Zeguo Tang 3 , Anirudh Sharma 1 , Takumi Kinoshita 4 , Fumiyasu Awai 4 , Eric Cloutet 1 , Thierry Toupance 2 , Hiroshi Segawa 3, 4 , Georges Hadziioannou 1
Affiliation  

An efficient metal-free formulation of a hole transport material (HTM) based on an ionic liquid polymer is developed for n–i–p perovskite solar cells (PSCs), to address reproducibility issues related to the use of complex dopant mixtures based on lithium salts and cobalt coordination complexes. The conductivity of the HTM is thus significantly improved by 4 orders of magnitude, up to 1.9 × 10–3 S·cm–1, using poly(1-butyl-3-vinylimidazolium bis(trifluoromethylsulfonyl)imide) (PVBI-TFSI) as dopant. Introduced in the FTO/c-TiO2/mp-TiO2/K0.05 (MA0.15FA0.85)0.95PbI2.55Br0.45/HTM/Au PSC configuration, PVBI-TFSI-HTM formulation shows power conversion efficiency as high as 20.3%, versus 18.4% for the standard lithium salt-HTM formulation, with considerably reduced hysteresis and excellent reproducibility. Mechanistic investigations suggest that PVBI-TFSI acts as a source of protons promoting the HTM oxidation.

中文翻译:

通过聚(离子液体)p掺杂空穴传输材料,可实现20%以上的效率和无滞后的钙钛矿型太阳能电池

针对n–i–p钙钛矿太阳能电池(PSC),开发了一种基于离子液体聚合物的无空穴传输材料(HTM)的高效无金属配方,以解决与使用基于锂的复杂掺杂剂混合物有关的重现性问题盐和钴配位化合物。因此,使用聚(1-丁基-3-乙烯基咪唑双(三氟甲基磺酰基)酰亚胺)(PVBI-TFSI)作为材料,HTM的电导率显着提高了4个数量级,达到1.9×10 –3 S·cm –1。掺杂物。引入FTO / c-TiO 2 / mp-TiO 2 / K 0.05(MA 0.15 FA 0.850.95 PbI 2.55 Br 0.45在/ HTM / Au PSC配置中,PVBI-TFSI-HTM配方显示出高达20.3%的功率转换效率,而标准锂盐-HTM配方显示出18.4%的功率转换效率,同时具有显着降低的磁滞和出色的可重复性。机理研究表明,PVBI-TFSI是促进HTM氧化的质子来源。
更新日期:2020-01-14
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