Efficient inverted polymer solar cells employing favourable molecular orientation

Varun Vohra, Kazuaki Kawashima, Takeshi Kakara, Tomoyuki Koganezawa, Itaru Osaka, Kazuo Takimiya, Hideyuki Murata

Research output: Contribution to journalArticlepeer-review

754 Citations (Scopus)


Improving the power conversion efficiency of polymer-based bulk-heterojunction solar cells is a critical issue. Here, we show that high efficiencies of 1/410% can be obtained using the crystalline polymer PNTz4T in single-junction inverted cells with a thick active layer having a thickness of 1/4300...nm. The improved performance is probably due to the large population of polymer crystallites with a face-on orientation and the favourable' distribution of edge-on and face-on crystallites along the film thickness (revealed by in-depth studies of the blend films using grazing-incidence wide-angle X-ray diffraction), which results in a reduction in charge recombination and efficient charge transport. These results underscore the great promise of polymer solar cells and raise the hope of achieving even higher efficiencies by means of materials development and control of molecular ordering.

Original languageEnglish
Pages (from-to)403-408
Number of pages6
JournalNature Photonics
Issue number6
Publication statusPublished - 2015 Jun 30


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