Sains Malaysiana 39(4)(2010): 627–631

Effects of Annealing Temperature on the Optical Properties and Device Performance of Ag / n-Si / CuPc / Ag Solar Cell Prepared via Spin Coating Method

(Kesan Suhu Sepuh Lindap ke atas Sifat Optik dan Prestasi Peranti Sel Suria Ag / n-Si / CuPc / Ag yang disediakan Melalui Kaedah Salutan Berputar)

HanashriahHassan*, Noor Baa’yahIbrahim& Zahari Ibarahim

School of Applied Phyics, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

Diserahkan: 14 Ogos 2009 / Diterima: 5 November 2009

ABSTRACT

Copper phthalocyanine (CuPc) thin films have been prepared using a simple spin coating method. The films were annealed at 5 different temperatures (323, 373, 473, 523 and 573 K) for one hour in air. Optical properties study using the UV-Vis spectrophotometer showed that in the range of wavelength of 300-800 nm, all of the films have identical absorption coefficient patterns and there was no systematic changes with respect to annealing temperature. The film annealed at 373 K showed the highest absorbance while the lowest absorbance was shown by the film annealed at 323 K. The results showed that the optical band gaps depended on the temperature. The film annealed at 373 K has the lowest optical energy gap. Using the five annealed films, solar cell with the configuration of Ag / n-Si / CuPc / Ag were fabricated. Under the 50 W/cm2 light illumination, the current voltage measurements at room temperature were carried out on the device. The device which consists of film annealed at 373 K exhibited the best photovoltaic characteristics. The different annealing temperature also affect the photovoltaic behavior of the devices in a non-systematic way.

Keywords: Annealing; current-voltage; optical band gap; solar cell

ABSTRAK

Filem nipis kuprum ftalosianina (CuPc) telah disediakan melalui kaedah ringkas salutan berputar. Filem tersebut disepuh lindap pada 5 suhu yang berbeza (323, 373, 473, 523 dan 573 K) selama satu jam dalam udara. Sifat optik yang dikaji menggunakan UV-Vis spektrofotometer menunjukkan pada julat panjang gelombang 300-800 nm, semua filem mempunyai corak pekali penyerapan yang sama dan tiada perubahan sistematik terhadap suhu sepuh lindap. Filem yang disepuh lindap pada 373 K menunjukkan penyerapan tertinggi manakala penyerapan terendah ditunjukkan oleh filem yang disepuh lindap pada 323 K. Keputusan menunjukkan jurang tenaga optik adalah bergantung kepada suhu. Filem yang disepuh lindap pada suhu 373 K mempunyai jurang tenaga optik paling rendah. Menggunakan kelima-lima filem yang disepuh lindap itu, sel suria dengan konfigurasi Ag / n-Si / CuPc / Ag telah difabrikasi. Di bawah pancaran 50 W/cm2, pengukuran arus-voltan pada suhu bilik telah dilakukan ke atas peranti. Peranti yang mengandungi filem yang disepuh lindap pada 373 K mempamerkan ciri fotovoltaik terbaik. Suhu sepuh lindap yang berbeza juga memberi kesan kepada sifat fotovoltaik peranti secara tidak sistematik.

Kata kunci: Arus-voltan; jurang tenaga optik; sepuh lindap; sel suria

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* Corresponding author; email: baayah@ukm.my