-Ming Chen

Comparison of Different Encapsulating Adhesives to Enhance the Efficiencies and Lifetimes of Polymeric Solar Cells

Polymeric solar cells (PSCs) with a derivative of C60 [[6,6]-phenyl C61-butyric acid methyl ester (PCBM)], and 3-hexylthiophene (P3HT) as active layers have been fabricated. The PSC devices were also packaged with glass and novel UV glues to improve their lifetimes and power conversion efficiencies (PCEs). After encapsulation with UV glue I, II, and III, the PCEs of PSCs reached 4, 4.82, and 6%, respectively, and their half-lifetimes increased to 16–18, 26–28, and 90 h, respectively, while the PCEs and half-lifetimes of PSCs without encapsulation were 3.76% and 2.5 h, respectively.

Ordering effects in MOCVD grown Ga0.5In0.5P on misoriented (100) GaAs

Abstract The effects of substrate misorientation on the structural and optical properties of Ga 0.5 In 0.5 P on GaAs grown by low pressure metalorganic vapor phase epitaxy have been studied. The highest degree of ordering was found on the (100) exact substrates. The degree of ordering was found to decrease with the increase of misorientation angle toward all four directions, [111], [111], [110] and [101]; the most effective misorientation to disorder is tilted toward [111]. The band gap energy increases monotonically with increasing angle of misorientation. The value of the full width at half maximum (FWHM) is 14 meV for GaInP on 6° off toward [111] sample; this is among the narrowest FWHM ever reported at low temperature. For three other tilt directions, the FWHM initially increase at a small tilt angle and then decrease with increasing tilt angle. From these, we found the best misorientation is tilted toward [111] which has the disordered structure to achieve the high energy band gap and narrow FWHM.