An ammonia modified PEDOT: PSS for interfacial engineering in inverted planar perovskite solar cells |
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| Affiliation: | 1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing, 100871, PR China;2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871, PR China;3. Dongguan NO. 6 Senior High School, Dongguan, 523420, PR China;4. Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, 402160, PR China;5. New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou, 350002, PR China;1. Xinyu Institute of New Energy, Xinyu University, Xinyu 338004, China;2. Department of Materials Science and Mechanical Engineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh 15261, USA;1. Department of Chemistry, Universidad de los Andes, Bogotá D.C. 111711, Colombia;2. Department of Chemical Engineering, Universidad de los Andes, Bogotá D.C. 111711, Colombia;1. Research Branch of Advanced Functional Materials, Institute of Microelectronic & Solid State Electronic, High-Temperature Resistant Polymers and Composites Key Laboratory of Sichuan Province, University of Electronic Science & Technology of China, Chengdu, 610054, PR China;2. University of Electronic Science & Technology of China, Chengdu, 610054, PR China;3. College of Polymer Science and Polymer Engineering, University of Akron, Akron, OH, 44325, United States;1. College of Energy, Soochow Institute for Energy and Materials InnovationS & Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006, China;2. Laboratory for New Fiber Materials and Modern Textile, Growing Base for State Key Laboratory, College of Chemical Engineering, Qingdao University, Qingdao, 266071, China;3. Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China |
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| Abstract: | Poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) is one of the most widely used hole transport layers (HTL) in inverted perovskite solar cells (PSCs) due to its simple solution-processed ability, high transparency, and conductivity. However, PEDOT:PSS-based devices suffer a lower open-circuit voltage (Voc) than devices with the conventional structure. To address this issue, we fabricated ammonia-modified PEDOT:PSS films by simply doping PEDOT:PSS solution with different ratio of ammonia. The acidity of PEDOT:PSS can be neutralized by the doped ammonia, which inhibits the ion-exchange reaction between PSS-H and CH3NH3I, thus retarding the reduction of the work function for PEDOT:PSS to some extent. As a result, a superior power conversion efficiency (PCE) of 15.5% was obtained for the device based on the ammonia-doped PEDOT:PSS HTL than that of the pristine PEDOT:PSS-based device. We ascribe the PCE enhancement to the increased Voc and fill factor (FF), which is attributed not only to the better energy-level alignment between the ammonia-modified PEDOT:PSS film and perovskite layer but also to the increased grain size and crystallinity of perovskite film. |
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| Keywords: | Perovskite solar cell Interfacial engineering PEDOT:PSS Hole transport layer |
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