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Dalam kajian ini, kesan kepekatan pendopan CuI dalam lapisan aktif poli (3-heksilthiofena-2,5-dil) (P3HT): (6,6)-fenil-C61 butrik asid metil ester (PCBM) terhadap prestasi sel suria organik jenis songsang di bawah cahaya luar piawai (AM1.5 G) dan diod pemancar cahaya (LED) putih telah dikaji. Peranti dengan kepekatan pendopan CuI sebanyak 9 bt% memberi prestasi terbaik bagi kedua-dua keadaan pencahayaan dengan kecekapan penukaran kuasa (PCE) yang tertinggi pada 2.46% dan 5.17%, masing-masing di bawah cahaya luar dan dalam. Bagi pengoptimuman lanjut, kesan kepekatan larutan penyediaan lapisan aktif P3HT:PCBM terdop CuI terhadap prestasi sel suria organik telah dikaji. Didapati kepekatan optimum lapisan aktif adalah berbeza di bawah cahaya dalam dan luar. Peranti dengan kepekatan larutan lapisan aktif yang tinggi (50 mg/mL) memberikan prestasi terbaik di bawah cahaya LED dengan PCE 8.14% manakala lapisan aktif dengan kepekatan biasa (25 mg/mL) menunjukkan prestasi terbaik di bawah cahaya AM1.5G (2.46%).

Previous study showed that the introduction of solution-dispersed copper iodide (CuI) as anode buffer layer has improved the performance of inverted type organic solar cell. However, the CuI preparation parameters have yet to be optimized for the inverted type organic solar cell. In this work, the effect of ultrasonic agitation of CuI solution on inverted type organic solar cell based on zinc oxide (ZnO)/poly(3-hexylthiophene) (P3HT):(6,6)-phenyl-C61-butyric acid methyl ester (PCBM) has been studied. ZnO, acting as electron transporter, was spin-coated on top of fluorine tin oxide (FTO) substrate, while the active layer consisting of P3HT:PCBM as the electron donor and electron acceptor was spin-coated onto the ZnO layer and the top electrode, silver (Ag) was then thermally evaporated. CuI dispersed in acetonitrile solution was ultrasonicated with durations of 10, 20 and 30 min and then was spin-coated on the active layer. It was found that solution-dispersed CuI with longer ultrasonic agitation duration attained a relatively higher PCE than that with shorter duration and the highest PCE was 2.13%, achieved at 30 min ultrasonic agitation due to good film surface morphology. For further optimization, the deposition of CuI was carried out using different spin coating speeds of 1000 and 3000 rpm. The optimum PCE obtained was 2.29 at a spin coating speed of 3000 rpm as a result of uniform layer of CuI.

In this work, we proposed solution-dispersion of copper iodide (CuI) anode buffer layer (ABL) for inverted organic solar cell (I-OSC) application. It was found that device coated with CuI ABL achieved a higher power conversion efficiency of 3.20%, which can be attributed to the significant improvement of the photovoltaic properties such as short circuit current density (Jsc) and fill factor. The electrical characterizations (i.e. series resistance (Rseries), shunt resistance (Rshunt) and impedance measurement) have revealed that the free holes can be extracted to the anode electrode more effectively through CuI ABL compared to that of standard device (without CuI). As a result, CuI suppressed holes to recombine with electrons residing at the lowest unoccupied molecular orbital of PCBM. The obtained results indicate that CuI is an effective ABL and solution dispersion method can be used to apply for I-OSC application. We believe that this work is suitable to apply in low-temperature processed flexible-based optoelectronic devices.

In this study, the effect of doping CuI into the active layer of poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl-C61-butyric acid methyl ester (PCBM) in inverted type organic solar cell for low light application was investigated. The CuI-doped and undoped solar cells displayed power conversion efficiency (PCE) of 2.04% and 1.44%, respectively, under 1-sun illumination. It is interesting to find that the solar cell with CuI doping achieved an even higher PCE of 4.84% compared to the undoped device (3.42%) under white LED light. This improvement is attributed to the CuI doping that improved the hole collection and reduced the charge recombination.