Selected recent works:

Ocaya, R.O., Yakuphanoglu, F., Ocaya–Yakuphanoglu method for series resistance extraction and compensation of Schottky diode I-V characteristics (2021), Measurement, Vol. 186 art. No. 110105. DOI: http://dx.doi.org/10.1016/j.measurement.2021.110105

Ocaya, R.O., Thermal tuning of light-emitting diode wavelength as an implication of the Varshni equation (2020) Measurement: Journal of the International Measurement Confederation, Vol. 162, art. no. 107910. DOI: https://dx.doi.org/10.1016/j.measurement.2020.107910

Malevu, T.D., Mwankemwa, B.S., Tshabalala, K.G., Ocaya, R.O., Effect of annealing on the efficiency of ambient-atmosphere fabricated MAPbI3 perovskite solar cells (2020) Scientific African, 8, art. no. e00447. DOI: https://dx.doi.org/10.1016/j.sciaf.2020.e00447

Malevu, T.D., Mwankemwa, B.S., Ahmed, M.A.M., Motaung, T.E., Tshabalala, K.G., Ocaya, R.O., Effect of Ni Doping on ZnO Nanorods Synthesized Using a Low-Temperature Chemical Bath (2019) Journal of Electronic Materials, 48 (11), pp. 6954-6963. DOI: https://dx.doi.org/10.1007/s11664-019-07490-2

Ocaya, R.O., Terblans, J.J., Addressing the challenges of standalone multi-core simulations in molecular dynamics (2019) Physical Sciences Reviews, 2 (7), art. no. 20165100. DOI: https://dx.doi.org/10.1515/psr-2016-5100

Malevu, T.D., Mwankemwa, B.S., Motloung, S.V., Tshabalala, K.G., Ocaya, R.O., Effect of annealing temperature on nano-crystalline TiO2 for solar cell applications (2019) Physica E: Low-Dimensional Systems and Nanostructures, 106, pp. 127-132. DOI: https://dx.doi.org/10.1016/j.physe.2018.10.028

Malevu, T.D., Mwankemwa, B.S., Tshabalala, K.G., Diale, M., Ocaya, R.O., Effect of 6R and 12R lead iodide polytypes on MAPbI3 perovskite device performance (2018) Journal of Materials Science: Materials in Electronics, 29 (15), pp. 13011-13018. DOI: https://dx.doi.org/10.1007/s10854-018-9422-4

Tataroglu, A., Ocaya, R., Dere, A., Dayan, O., Serbetci, Z., Al-Sehemi, A.G., Soylu, M., Al-Ghamdi, A.A., Yakuphanoglu, F., Ruthenium(II) Complex Based Photodiode for Organic Electronic Applications (2018) Journal of Electronic Materials, 47 (1), pp. 828-833. DOI: https://dx.doi.org/10.1007/s11664-017-5882-1

Ocaya, R.O., Terblans, J.J., Temperature specification in atomistic molecular dynamics and its impact on simulation efficacy (2017) Journal of Physics: Conference Series, 905 (1), art. no. 012031. DOI: https://dx.doi.org/10.1088/1742-6596/905/1/012031

Mensah-Darkwa, K., Ocaya, R., Dere, A., Al-Sehemi, A.G., Al-Ghamdi, A.A., Soylu, M., Gupta, R.K., Yakuphanoglu, F., Dye based photodiodes for solar energy applications (2017) Applied Physics A: Materials Science and Processing, 123 (10), art. no. 622. DOI: https://dx.doi.org/10.1007/s00339-017-1221-x

Ocaya, R.O., Dere, A., Al-Sehemi, A.G., Al-Ghamdi, A.A., Soylu, M., Yakuphanoglu, F., Analysis of photoconductive mechanisms of organic-on-inorganic photodiodes (2017) Physica E: Low-Dimensional Systems and Nanostructures, 93, pp. 284-290. DOI: https://dx.doi.org/10.1016/j.physe.2017.06.024

Ocaya, R.O., Estimating p using an electrical circuit (2017) European Journal of Physics, 38 (1), art. no. 015803. DOI: https://dx.doi.org/10.1088/0143-0807/38/1/015803

Ocaya, R.O., Al-Sehemi, A.G., Al-Ghamdi, A., El-Tantawy, F., Yakuphanoglu, F., Organic semiconductor photosensors (2017) Journal of Alloys and Compounds, 702, pp. 520-530. DOI: https://dx.doi.org/10.1016/j.jallcom.2016.12.381

Ocaya, R.O., Özdemir, M., Özdemir, R., Al-Ghamdi, A., Usta, H., Farooq, W.A., Yakuphanoglu, F., Ambipolar small molecular semiconductor-based heterojunction diode (2016) Synthetic Metals, 221, pp. 48-54. DOI: https://dx.doi.org/10.1016/j.synthmet.2016.10.001

Invited Talks:

•  Method for series resistance extraction from the I-V characteristics of Schottky diodes, 8th International conference on materials science and nanotechnology for next generation (MSNG2021), 14 -16 July 2021 http://msng2021.fytronix.com/invited_speakers.html

• 5th Collaboration Symposium - Central University of Technology, 27th November 2020

• The Reuse and Recyling of Electronic Components, a talk in the "60 Years Celebration of University of Zululand", 9th October 2020

Computing, Mathematical methods, New techniques for device characterization, Material science, and  Embedded and microcontroller-based instrument design.

Solid State Physics (PHYS3724), Electronics (PHYS2624), Electronics (PHYE6844), Computational Physics (PHYS6864), Semiconductors (PHYI6864).

1. Ambassador - UFS Rhodes Scholarship Trust Ambassador (2020-2023)

2. Member - editorial board of Insight Physics journal http://insight.piscomed.com/index.php/IP/about/editorialTeam

3. External Examiner - 

1. University of Botswana (2006-present)
2. Medical University of South Africa (formerly Medunsa – Pretoria Campus): 2006-2008
3. NWU (Mafikeng Campus): 2012 –present
4. School of Physics & Chemistry (UKZN): 2020 and ongoing
5. University of Limpopo

Over the years I also received a number of Certificates of Appreciation from various centers in appreciation of my contributions to their operation and smooth-running. Most notably,

1. University of Botswana Library –for the efficient C++ software program that I wrote to convert the archaic TinLib Database to the new Innopac System, August 1999.
2. Sol Plaatje Primary School (Mafikeng) – certificate awarded for configuring their media laboratory into a huge success – 2005.
3. Mmabatho High School (Mafikeng) – certificate awarded for co-supervision of High School Project that excelled in Provincial Science fair – February 2006.

I have also engaged societal structures, such as Maluti-a-Phofung (MAP) Water, to sensitize them about our capabilities in supporting their governance through innovations. In particular, I promoted the telemetry patent to them in 2008 in anticipation of the water and electricity crisis that MAP now faces.

Other engagements have included local companies interested in low-cost energy solutions, particularly solar, and schools. With the latter, I actively run the Bayers Naude/Kagiso Schools “Dinaledi” project through 2008. I was in charge of four local Free State, schools (Dikwena, Moteka, Tsebo and Reahola), with the mandate to advise the organization on the best methods to upgrade and maintain their physical sciences. A report in the terminal year of the project indicated that this intervention resulted in a dramatic improvement of the matric pass rate. In two cases (Moteka and Reahola High Schools), it went from the low thirties to almost 100%. Other schools with which I have been involved in similar capacities are Tsholo High School (Qwaqwa), New Horizon College (Harrismith) and Harrismith High School (Intabazwe, Harrismith).