Efficiency enhancement of organic solar cells by inserting PbS quantum dots film as the infrared absorption layer

Research paper by Haowei Wang, Weile Li, Yueli Huang, Yishan Wang, Shengyi Yang, Bingsuo Zou

Indexed on: 22 Oct '16Published on: 18 Oct '16Published in: Materials Letters


Organic materials show great potentials in high-efficiency organic solar cells, however, few organic materials can efficiently utilize the near infrared light due to their relative large band-gap. Here, we demonstrate quantum dots-based hybrid solar cells by inserting PbS nanocomposite film as the infrared absorption layer, resulting in a significant enhancement in short-circuit current. After appropriate ligands exchange, the device with PbS absorption layer showed an improved power conversion efficiency (PCE) of 3.08% under AM 1.5 solar illumination, amounting to 91% enhancement over that of the pure organic multilayer structure solar cell indium-tin oxide (ITO)/poly(3-hexylthiophene) (P3HT)/ polymer-[6,6]-phenyl-C61-butyric acidmethyl ester (PCBM)/Ca/Al. Therefore, this approach can be applied to a wide range of quantum dots and polymer hybrids for its solution-processing, thereby offering a general scheme to improve the efficiency of organic–inorganic hybrid solar cells and it provides a promising way to make high-efficiency solar cells.

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