[13p-B4-1~8] 12.5 Organic solar cells

▲ [13p-B4-5] Air stable PbSe quantum dot heterojunction solar cell: ligand dependent exciton dissociation, recombination, photovoltaic property and stability

〇(D)Yaohong Zhang¹, Ding Chao¹, Jin Chang², Taro Toyoda^1,3, Yuhei Ogomi⁴, Shuzi Hayase^3,4, Qing Shen^1,3 (1.Univ. Electro-Commun., 2.Nanjing Tech. Univ., 3.CREST JST, 4.Kyushu Inst. Tech.)

Keywords:PbSe quantum dots, ligand, solar cells

Compared with conventional solar cells, quantum dot solar cells (QDSCs) are easier to prepare with low fabrication cost. Additionally, QDs present high extinction coefficients, tunable absorption spectra, and multiple exciton generation (MEG) effect. PbSe QDs have attracted attention due to their small bulk bandgap, high dielectric constant, and large exciton Bohr radius. However, the performance of PbSe based QDSCs tend to quickly degrade after the solar cells expose to air. Here, we investigated the ligand dependent air stability, energy level shift and charge transfer of ligand-treated PbSe QDs. In addition, the exciton dissociation, recombination processes and carrier lifetimes in PbSe QDSCs were also revealed through transient absorption (TA) spectra, and open-circuit transient voltage decay measurements.