Homogenizing the sulfonic acid distribution of DMF-modified PEDOT:PSS films and perovskite solar cells

Hongliang Li; Cuiling Zhang; Yunping Ma; Zhiqiang Li; Ying Xu; Yaohua Mai

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Homogenizing the sulfonic acid distribution of DMF-modified PEDOT:PSS films and perovskite solar cells

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Inverted perovskite solar cells using pristine PEDOT:PSS as the hole-transporting layer (HTL) have been widely studied for its less hysteresis and low-temperature preparation technologies. However, this device suffers from an inferior open-circuit voltage (VOC) and stability problems. Several attempts have made on film formation and interface engineering to improve the efficiency. Modification proved beneficial to decrease energy offset at the interface between the HTL layer and the adjacent perovskite layer. In this paper, modification PEDOT:PSS layers were realized with a dimethyl formamide (DMF) solvent. The sulfonic acid distribution was homogenized in the normal directi on after modification. The work function of the modified PEDOT:PSS layers increased from 4.71 to 5.07eV, and the conductivity of modified PEDOT:PSS increased from 3×10^-4 to 0.45 S/cm. The as-deposited perovskite films were more uniform with larger grain sizes and less pinholes, resulting in an improved VOC from 0.93 to 1.048 V, while the efficiency was increased from 11.5% to 16.8%. Solar cells without encapsulation under the 50 h and 50% humidity aging test showed 7% degradation of fill factor (FF) with 50 v/v% PEDOT:PSS layer, while the fill factor decreased 11.2% in the 0 v/v% PEDOT:PSS layer, respectively.

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《天然气化学（英文版）》 |2019年第5期|71-77|共7页
作者
Hongliang Li; Cuiling Zhang; Yunping Ma; Zhiqiang Li; Ying Xu; Yaohua Mai;
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作者单位

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of Photovoltaics College of Physics Science and Technology Hebei University Baoding 071002 Hebei China;

Institute of New Energy Technology College of Information Science and Technology Jinan University Guangzhou 510632 Guangdong China;

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Homogenizing the sulfonic acid distribution of DMF-modified PEDOT:PSS films and perovskite solar cells

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