Effect of cuprous halide interlayers on the device performance of ZnPc/C{sub 60} organic solar cells

Journal Article · Wed Oct 15 04:00:00 EDT 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.03.030· OSTI ID:22420583

Lee, Jinho; Park, Dasom; Heo, Ilsu; Yim, Sanggyu

Highlights: • Effect of CuX interlayers on subsequently deposited films and devices was studied. • CuI is the most effective for the performance of ZnPc/C{sub 60}-based solar cells. • Results were related to the molecular geometry of ZnPc and HOMO level of interlayers. - Abstract: The effect of various cuprous halide (CuX) interlayers introduced between a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) layer and zinc phthalocyanine (ZnPc) layer on the physical properties of the ZnPc thin films and device performances of ZnPc/C{sub 60}-based small-molecule organic solar cells was studied. Strong substrate–molecule interaction between the CuX and ZnPc partly converted surface-perpendicular stacking geometry of ZnPc molecules into surface-parallel one. This flat-lying geometry led to an enhancement in electronic absorption and charge transport within the ZnPc films. As a result, the overall power conversion efficiency of the cell with CuI interlayer increased by ∼37%. In the case of the cells with CuBr and CuCl interlayer, however, the enhancement in device performances was limited because of the reduced conversion of the molecular geometry and increased energy barrier for hole extraction due to the low highest occupied molecular orbital level of the interlayer.

• OSTI ID: 22420583
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 58; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE TRANSPORT
COPPER BROMIDES
COPPER CHLORIDES
COPPER IODIDES
DIFFUSION BARRIERS
FULLERENES
HOLES
LAYERS
MOLECULAR ORBITAL METHOD
ORGANIC SOLAR CELLS
PHTHALOCYANINES
POLYSTYRENE
SUBSTRATES
SULFONATES
THIN FILMS
X-RAY DIFFRACTION
ZINC COMPOUNDS