Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy

Yaohong Zhang; Guohua Wu; Chao Ding; Feng Liu; Yingfang Yao; Yong Zhou; Congping Wu; Naoki Nakazawa; Qingxun Huang; Taro Toyoda; Ruixiang Wang; Shuzi Hayase; Zhigang Zou; Qing Shen

doi:10.1021/acs.jpclett.8b01514

Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy

J Phys Chem Lett. 2018 Jul 5;9(13):3598-3603. doi: 10.1021/acs.jpclett.8b01514. Epub 2018 Jun 18.

Authors

Yaohong Zhang¹, Guohua Wu², Chao Ding¹, Feng Liu¹, Yingfang Yao³, Yong Zhou³, Congping Wu⁴, Naoki Nakazawa¹, Qingxun Huang¹, Taro Toyoda¹, Ruixiang Wang⁵, Shuzi Hayase⁶, Zhigang Zou^{3

4}, Qing Shen¹

Affiliations

¹ Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan.
² School of Materials Science and Engineering , Shaanxi Normal University , Xi'an 710119 , China.
³ Ecomaterials and Renewable Energy Research Center, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures , Nanjing University , Nanjing 210093 , China.
⁴ Kunshan Sunlaite New Energy Technology Co. Ltd ., Suzhou 215347 , China.
⁵ Beijing Engineering Research Centre of Sustainable Energy and Buildings , Beijing University of Civil Engineering and Architecture , Beijing 102616 , China.
⁶ Faculty of Life Science and Systems Engineering , Kyushu Institute of Technology , Fukuoka 808-0196 , Japan.

PMID: 29905077
DOI: 10.1021/acs.jpclett.8b01514

Abstract

Lead selenide (PbSe) colloidal quantum dots (CQDs) are considered to be a strong candidate for high-efficiency colloidal quantum dot solar cells (CQDSCs) due to its efficient multiple exciton generation. However, currently, even the best PbSe CQDSCs can only display open-circuit voltage ( V_oc) about 0.530 V. Here, we introduce a solution-phase ligand exchange method to prepare PbI₂-capped PbSe (PbSe-PbI₂) CQD inks, and for the first time, the absorber layer of PbSe CQDSCs was deposited in one step by using this PbSe-PbI₂ CQD inks. One-step-deposited PbSe CQDs absorber layer exhibits fast charge transfer rate, reduced energy funneling, and low trap assisted recombination. The champion large-area (active area is 0.35 cm²) PbSe CQDSCs fabricated with one-step PbSe CQDs achieve a power conversion efficiency (PCE) of 6.0% and a V_oc of 0.616 V, which is the highest V_oc among PbSe CQDSCs reported to date.