Effects of organic inorganic hybrid perovskite materials on the electronic properties and morphology of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and the photovoltaic performance of planar perovskite solar cells
Effects of organic inorganic hybrid perovskite materials on the electronic properties and morphology of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and the photovoltaic performance of planar perovskite solar cells
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DOI：
10.1039/c5ta03456f
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发表时间：
2015-07
影响因子：
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通讯作者：
Yijie Xia;K. Sun;Jingjing Chang;Jianyong Ouyang
中科院分区：
文献类型：
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作者：
Yijie Xia;K. Sun;Jingjing Chang;Jianyong Ouyang
钙钛矿型太阳能电池(PSCs)以其低廉的制造成本和令人印象深刻的能量转换效率而备受关注。平面PSCs的钙钛矿层通常是通过在poly(3，4-ethylenedioxythiophene)：poly(styrenesulfonate)(PEDOT：PSS，Clevios P VP Al4083)上包覆钙钛矿前驱体PbI2、PbCl2和甲基碘化铵(MAI)的溶液来制备的。其中，前驱体溶液中钙钛矿层的沉积显著影响PEDOT：PSS薄膜的电子结构和性质，从而影响平面PSCs的光伏性能。PEDOT：PSS的电导率从10−3显著提高到10 1 S cm−1。电导率的提高不是由于溶剂，而主要是MAI。在PEDOT：PSS薄膜表面涂覆一层二甲基甲酰胺(DMF)的MAI溶液后，薄膜的电导率得到了更显著的提高，而纯DMF仅使PEDOT：PSS薄膜的电导率增加了2-3倍。电导率的提高归因于PSSH链与PEDOT：PSS的相分离和PEDOT链的构象变化。用MAI的有机溶液和钙钛矿前驱体溶液的溶剂处理PEDOT：PSS也会影响平面PSCs的光伏性能。
Perovskite solar cells (PSCs) have attracted considerable attention because of their low fabrication cost and impressive energy conversion efficiency. The perovskite layer of planar PSCs is usually prepared by coating a solution of perovskite precursors, that is, PbI2, PbCl2 and methylammonium iodide (MAI), on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS, Clevios P VP Al 4083). Here, the deposition of the perovskite layer from its precursor solution saliently affects the electronic structure and properties of PEDOT:PSS films and thus the photovoltaic performance of planar PSCs. The conductivity of PEDOT:PSS is significantly enhanced from 10−3 to 101 S cm−1. The conductivity enhancement is not due to the solvent but mainly MAI. Even more significant conductivity enhancement occurs for PEDOT:PSS films after being coated with a dimethylformamide (DMF) solution of MAI, while pure DMF only slightly increases the conductivity of PEDOT:PSS by a factor of 2–3. PEDOT:PSS films become rougher after the deposition of a perovskite or MAI layer. The conductivity enhancements are attributed to the phase segregation of PSSH chains from PEDOT:PSS and the conformational change of PEDOT chains. The treatment of PEDOT:PSS with the organic solutions of MAI and solvents of perovskite precursor solutions also affects the photovoltaic performance of the planar PSCs.