Integration of planar and bulk heterojunctions in polymer/nanocrystal hybrid photovoltaic cells

Zhanao Tan; Ting Zhu; Myo Thein; Shuai Gao; An Cheng; Fan Zhang; Chunfeng Zhang; Huaipeng Su; Jingkang Wang; Henderson, Ron; Jong-in Hahm; Yongping Yang; Jian Xu
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p063510
Academic Journal
We present in this communication a hybrid polymer/nanocrystal photovoltaic device architecture wherein a net poly(3-hexylthiophene) (P3HT) light-absorbing film is inserted underneath the blended layer of P3HT and PbSe nanocrystal quantum dots in the active region. Such a design features the vertical integration of planar and bulk heterojunctions, which allows for the employment of a thinner bulk heterojunction for more efficient carrier collection without an excessive reduction of the overall light absorption by the photovoltaic cell. The measured device performance represents a significant improvement over previously reported hybrid cells containing bulk heterojunctions of P3HT and Pb(S,Se) nanocrystal quantum dots.


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