Improvement of Photovoltaic Performance of Colloidal Quantum Dot Solar Cells Using Organic Small Molecule as Hole-Selective Layer

Yaohong Zhang; Guohua Wu; Iván Mora-Seró; Chao Ding; Feng Liu; Qingxun Huang; Yuhei Ogomi; Shuzi Hayase; Taro Toyoda; Ruixiang Wang; Joe Otsuki; Qing Shen

doi:10.1021/acs.jpclett.7b00683

Improvement of Photovoltaic Performance of Colloidal Quantum Dot Solar Cells Using Organic Small Molecule as Hole-Selective Layer

J Phys Chem Lett. 2017 May 18;8(10):2163-2169. doi: 10.1021/acs.jpclett.7b00683. Epub 2017 May 1.

Authors

Yaohong Zhang¹, Guohua Wu², Iván Mora-Seró³, Chao Ding¹, Feng Liu¹, Qingxun Huang¹, Yuhei Ogomi⁴, Shuzi Hayase^{4

5}, Taro Toyoda^{1

5}, Ruixiang Wang⁶, Joe Otsuki², Qing Shen^{1

5}

Affiliations

¹ Faculty of Informatics and Engineering, The University of Electro-Communications , 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
² College of Science and Technology, Nihon University , 1-8-14 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan.
³ Institute of Advanced Materials (INAM), Universitat Jaume I , Avenida de Vicent Sos Baynat, s/n 12006 Castelló de la Plana, Spain.
⁴ Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology , 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan.
⁵ CREST, Japan Science and Technology Agency (JST) , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
⁶ Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture , No.15 Yongyuan Road, Huangcun, Daxing, Beijing 102616, China.

PMID: 28447790
DOI: 10.1021/acs.jpclett.7b00683

Abstract

A novel organic small molecule bis-triphenylamine with spiro(fluorene-9,9'-xanthene) as the conjugated system, named BTPA-4, is successfully synthesized and employed as the hole-selective layer (HSL) in colloidal quantum dots solar cells (CQDSCs). The introduction of BTPA-4 layer can significantly prolong effective carrier lifetime (τ_eff), increase charge recombination resistance (R_rec), and thus diminish the interfacial charge recombination at the PbS-QDs/Au electrode interface. The effect of BTPA-4 as HSL in the device performance is especially significant for the open-circuit voltage (V_oc) and power conversion efficiency (PCE), with a ∼ 10% and 15% enhancement respectively, comparing with those of device without the HSL. Furthermore, the PbS CQDSCs with BTPA-4 possessed a noticeably stable property for over 100 days of storage under ambient atmosphere.