2018年第79回応用物理学会秋季学術講演会

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12 有機分子・バイオエレクトロニクス » 12.5 有機太陽電池

[19a-432-1~12] 12.5 有機太陽電池

2018年9月19日(水) 09:00 〜 12:15 432 (432)

松島 敏則(九大)、白井 康裕(物材機構)

12:00 〜 12:15

[19a-432-12] Efficient Planar Perovskite Solar Cells via Interfacial Engineering with Anatase or Brookite TiO2 Single-Crystalline Nanoparticles

〇(P)Md Shahiduzzaman1,2、Sem Visal1、Hiroto Ashikawa1、Mizuki Kuniyoshi1、Tetsuya Kaneko1、Tetsuhiro Katsumata1、Tetsuya Taima2、Satoru Iwamori1、Masao Isomura1、Koji Tomita1 (1.Tokai Univ.、2.Kanazawa Univ.)

キーワード:Planar Perovskite Solar Cells, Interface Engineering, SP-TiO2/AT or BK SC-TiO2 NPs bilayer

The electron transport layer (ETL)/perovskite interface engineering plays a promising strategy to produce highly efficient planar heterojunction (PHJ) perovskite solar cells (PSCs). The deep trap states of ETL compact TiO2 surface facilitates a large leakage current and recombination of electron-hole pairs. Interfacial modification of TiO2 by a novel one-step hydrothermal processed single-crystalline anatase (AT) and/or brookite (BK) TiO2 NPs with average diameter sizes about 6 and 30 nm, respectively, is applied as an ETL bilayer to enhance the separation of charges and suppress the recombination rate. Herein, a novel TiO2/AT or BK TiO2 NPs bilayer was introduced by comprising spray pyrolysis (SP) deposition and spin-coating (SC) technique, respectively, in PHJ PSCs. A SP-TiO2/AT and BK SC-TiO2 NPs bilayer-based PSCs are facilitated more efficient electron transport, charge extraction, and low interfacial recombination, and thus leads champion efficiencies up to 17.05% and 16.74%, respectively, by a significant decrease of J-V hysteresis, presenting almost 12% enhancement compared to TiO2 single layer-based PSCs with PCE of 13.33%. The PHJ PSCs exhibited a spectral response that extended from the visible to the near-infrared region with a broad, flat absorption peak of intensity 80%-85% at approximately 380-750 nm. The higher IPCE value of the device with a bilayer in the visible-to-near-infrared wavelength region than those of the other devices suggests that the bilayer layer collect electrons more efficiently at the perovskite/TiO2 edge because it successfully lowers the interfacial energy barrier. The outstanding performance of the bilayer ETL based device is attributed to the enhanced the content of photogenerated charge carrier sites and reduced the agglomeration and trapping at the SP-TiO2 interface, as evident by PL analysis.