Perovskite Solar Cells Using Two-Dimensional Conjugated Polymers as Efficient Hole Transport Material

Hsiao-Chi Hsieh^a^,^b, Leeyih Wang^a^,^c, King-Fu Lin^b^,^c, Wen-Yen Chiu^b^,^c^,^d, Chuen-Yo Hsiow^c

^aNational Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

^bNational Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

^cNational Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

^dNational Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Hsiao-Chi Hsieh, 380
Publication date: 5th February 2015

National Renewable Energy Laboratory (NREL) announced that an excellent power conversion efficiency of 20.1% for perovskite solar cells has been realized. In such solar devices, the small molecule of 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)9,9′-spirobifluorene (spiro-OMeTAD) is the most expensive component in the cell due to its complicated synthetic route and tedious purification process. Additionally, the film-formation property of small molecules is usually poor so that a large quantity of material is required to completely cover the rough perovskite crystals, forming an uniform and continuous overlayer. In this study, a linear conjugated polymer, poly(3-hexylthiophene-2,5-diyl) (P3HT), and a two-dimensional polymer, poly{3-(5,5 ″ -di(2-ethylhexyl)-2,2 ′ :5 ′ ,2 ″ -terthiophenyl-3 ′ -vinyl)-thiophene-alt-thiophene} (PBTTTV-h), were employed as hole transport material (HTM) in layer-structured perovskite solar cells. Combined results from the J-V curves and SEM images indicate that the replacement of spiro-OMeTAD with polymer as HTM substantially reduces the optimal thickness from ~300 nm to ~100 nm. Furthermore, the electrochemical impedance spectroscopy measurements show that the transfer resistance of charge carrier from perovskite to HTM in the polymer-based cells is lower than that in the spiro-OMeTAD-based cell. On the other hand, benefitting from the low-lying HOMO level (-5.07 eV) and high hole mobility (4.8 × 10⁻⁴ cm² V⁻¹ s⁻¹), the PBTTTV-h-based devices exhibit an average open-circuit voltage (V_oc) and an average fill factor (FF), which are around 12% greater than those of the P3HT-based devices. As a result, the champion cell has a promising PCE of 14.8% with a V_oc of 950 mV, a J_sc of 21.27 mAcm^-2, and an FF of 0.73.

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