Strong electron-withdrawing materials of bis(trifluoromethanesulfonyl)amide (TFSA, [CF3SO2]₂NH) and bis(trifluoromethane)sulfonimide lithium salt (LiTFSI, [CF3SO2]₂NLi) are incorporated into the active layers of a porphyrin small molecule TDPPEZnP and PC₆₁BM for bulk heterojunction solar cells. While the solar cells based on the undoped devices show a power conversion efficiency (PCE) of 6.11% with a V_oc of 0.70 V, a J_sc of 13.92 mA cm⁻² and a FF of 62.71%, doping the active layers with very low loadings of LITFSI and TFSA leads to improved PCEs of 6.85% and 7.01% with J_sc values of 14.97 and 15.39 mA cm⁻² and FF values of 64.73% and 63.92%, accounting for 14% and 16% PCE enhancement, respectively. The improved performance is ascribed to the enhanced charge carrier transport, which is supported by charge mobility, impedance spectroscopy and transient spectroscopy analyses.

中文翻译：

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用LITFSI和TFSA掺杂基于卟啉的体异质结太阳能电池

将双（三氟甲烷磺酰基）酰胺（TFSA，[CF3SO2] ₂ NH）和双（三氟甲烷）磺酰亚胺锂盐（LiTFSI，[CF3SO2] ₂ NLi）的强吸电子材料掺入卟啉小分子TDPPEZnP和用于体异质结太阳能电池的PC ₆₁ BM。尽管基于未掺杂器件的太阳能电池的功率转换效率（PCE）为6.11％，V _oc为0.70 V，J _sc为13.92 mA cm ^-2，且FF为62.71％，但有源层的掺杂却非常低。 LIscSI和TFSA的低负载导致J _sc的PCE改善了6.85％和7.01％值分别为14.97和15.39 mA cm ^-2和FF值分别为64.73％和63.92％，分别占PCE增强的14％和16％。改善的性能归因于电荷载流子传输的增强，这由电荷迁移率，阻抗谱和瞬态谱分析支持。