Aluminium Nanoparticles Prepared by Ultrasonic Ablation Technique inside the Active Layer of Organic Solar Cell

Abstract

In the present work, chemical-free aluminium nanoparticles (Al NPs) have been incorporated inside active layer of organic solar cell (OSC) using a new ultrasonic ablation technique, by which the Al NPs have been physically prepared in 1,2-dichlorobenzene (DCB) as a solvent for preparing solar cell active layer. The concentration of Al NPs inside active layer can be increased by increasing the volume of DCB-Al NPs and, also, by increasing the ultrasonication time applied upon DCB-Al NPs mixture. The prepared Al NPs are incorporated inside the common P3HT:PCBM active layer without accumulation and with low distribution. Optical absorption of the P3HT:PCBM active layer is improved through plasmon resonance induced by Al NPs inside active layer. The fill factor (FF) is, also, improved by the presence of Al NPs which facilitate charge carrier transfer in the P3HT:PCBM solar cell. The FF can be reduced due to presence of Al bulk pieces inside active layer. However, these Al bulk pieces are dissociated under the effect of ultrasonic irradiation for longer time. Optical absorption as well as charge carrier transfer induced by Al NPs are the responsible to increase performance parameters of the P3HT:PCBM solar cell under increasing the concentration of Al NPs inside OSC. As a conclusion, the incorporation of Al NPs inside P3HT:PCBM solar cell induces a significant improvement of the FF by 35% and consequently, the PCE is improved with about 39%.

Tin instead of aluminum as a back electrode in P3HT:PC71BM organic solar cells

“…6, agree with those in the case of using aluminum as a back electrode, as stated in our previous works. 13,15) This means that the value of V oc may not depend on the difference between the work functions of the front and back electrodes in solar cells. The difference between the work functions of ITO and Sn electrodes equals 0.38 eV, as shown in Fig.…”

“…Depending on energy suitability with the active layer in OSCs, a thin aluminum film is often used as a back electrode in a solar cell composed of poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C 61 -butyric acid methyl ester (PC 61 BM). [13][14][15][16] Aluminum as a low-work-function metal (4.20 eV) 17,18) is not the ultimate choice as a back electrode for OSCs due to several drawbacks and defects. Aluminum with a small atomic radius (1.3607 Å) 19) can diffuse into the solar cell active layer and react with the organic active layer to distort its chemical and, therefore, physical properties.…”

Synthesis and Characterization of P3HT Metal Nanoparticles Hybrid Junction

“…This makes nanoparticles a very good candidate for technological applications, for instance in surface enhanced resonance Raman scattering, optical biosensor, and photo-catalysis. The metal NPs can be prepared by different techniques such as liquid chemical method, laser ablation in liquids with pico and femtosecond laser pulses (LAP), and by deposition of the metal on a substrate followed by thermal annealing [3].…”