Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate films with low conductivity and low acidity through a treatment of their solutions with probe ultrasonication and their application as hole transport layer in polymer solar cells and perovskite solar cells |
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| Affiliation: | 1. Department of Materials Science and Engineering, National University of Singapore, 117574, Singapore;2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China;3. School of Power Engineering, Chongqing University, Chongqing, 400044, China;4. Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of Education of China, Chongqing, 400044, China;5. Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, 117574, Singapore;1. Department of Materials Science and Engineering, National University of Singapore, 117576 Singapore, Singapore;2. NUS Graduate School for the Integrative Sciences and Engineering, National University of Singapore, 117456 Singapore, Singapore;3. Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, School of Power Engineering, Chongqing University, Chongqing 400044, China;1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria;2. Department of Soft Matter Physics, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria;3. Sensor Lab Department of Chemistry, University of Western Cape, Private Bag X17, Bellville, 7535 Cape Town, South Africa;4. Institute for Analytical Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria |
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| Abstract: | Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) has been widely used as the hole transport material in optoelectronic devices. To avoid the cross talk among different crossbars, PEDOT:PSS with low conductivity is required. It thus has a high loading of the non-conductive PSSH. The PSSH-to-PEDOT weight ratio is 6 for Clevios P VP Al 4083 that is the most popular polymer as the hole transport layer. However, the acidic PSSH brings severe problems to the device stability and performance. Here, PEDOT:PSS solutions with low acidity can be prepared through a facile treatment of PEDOT:PSS solution by probe ultrasonication. Two grades of PEDOT:PSS, Clevios PH1000 and Clevios P, with a PSSH-to-PEDOT weight ratio of 2.5 were treated by probe ultrasonication. The ultrasonication can lower the viscosity and the colloidal sizes of PEDOT:PSS solutions and conductivity of PEDOT:PSS films. The pH value of probe-ultrasonicated Clevios P was 2.12, higher than that (1.77) of pristine Clevios P VP Al 4083. The ultrasonication-treated PEDOT:PSS solutions were used as hole transport layer in polymer solar cells and perovskite solar cells. The photovoltaic performances of these solar cells are comparable to that of control devices employing Clevios P VP Al 4083 PEDOT:PSS as the hole transport layer. |
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| Keywords: | PEDOT:PSS Acidity Ultrasonication Polymer solar cells Perovskite solar cells |
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