Freitas, P (2023) Simulation and programming strategies to mitigate device non-idealities in memristor based neuromorphic systems. Doctoral thesis, Liverpool John Moores University.

Hu, Z, Zhang, W, Degraeve, R, Garbin, D, Chai, Z, Saxena, N, Freitas, P, Fantini, A, Ravsher, T, Clima, S, Zhang, J, Delhougne, R, Goux, L and Kar, G (2022) New Insights of the Switching Process in GeAsTe Ovonic Threshold Switching (OTS) Selectors. IEEE Transactions on Electron Devices. ISSN 0018-9383

Pereira, M, Deuermeier, J, Zhang, WD, Freitas, P, Barquinha, P, Martins, R, Fortunato, E and Kiazadeh, A (2022) Tailoring the synaptic properties of a-IGZO memristors for artificial deep neural networks. APL Materials, 10. ISSN 2166-532X

Chai, Z, Freitas, P, Zhang, WD, Zhang, JF and Marsland, J (2021) True Random Number Generator Based on Switching Probability of Volatile Gexse1-X Ovonic Threshold Switching Selectors. In: IEEE Explore . (2021 IEEE 14th International Conference on ASIC, 26 October 2021 - 29 October 2021, Kunming, China).

Chai, Z, Zhang, WD, Clima, S, Hatem, F, Degraeve, R, Diao, Q, Zhang, JF, Freitas, P, Marsland, J, Fantini, A, Garbin, D, Goux, L and Kar, G (2021) Cycling induced metastable degradation in GeSe Ovonic threshold switching selector. IEEE Electron Device Letters, 42 (10). pp. 1148-1451. ISSN 0741-3106

Brown, J, Zhang, JF, Zhou, B, Mehedi, M, Freitas, P, Marsland, J and Ji, Z (2020) Random‑telegraph‑noise‑enabled true random number generator for hardware security. Scientific Reports, 10. ISSN 2045-2322

Joksas, D, Freitas, P, Chai, Z, Ng, WH, Buckwell, M, Li, C, Zhang, WD, Xia, QF, Kenyon, AJ and Mehonic, A (2020) Committee Machines—A Universal Method to Deal with Non-Idealities in Memristor-Based Neural Networks. Nature Communications, 11 (4273). ISSN 2041-1723

Chai, Z, Freitas, P, Zhang, WD, Hatem, F, Degraeve, R, Clima, S, Zhang, J, Marsland, J, Fantini, A, Garbin, D, Goux, L and Kar, G (2020) Stochastic computing based on volatile GeSe ovonic threshold switching selectors. IEEE Electron Device Letters. ISSN 0741-3106

Chai, Z, Wei, S, Zhang, WD, Brown, J, Degraeve, R, Salim, F, Clima, S, Hatem, F, Zhang, JF, Freitas, P, Marsland, J, Fantini, A, Garbin, D, Goux, L and Kar, G (2019) GeSe-based Ovonic Threshold Switching Volatile True Random Number Generator. IEEE Electron Device Letters. ISSN 0741-3106

Chai, Z, Zhang, WD, Degraeve, R, Clima, S, Hatem, F, Zhang, JF, Freitas, P, Marsland, J, Fantini, A, Garbin, D, Goux, L and Kar, GS (2019) Dependence of switching probability on operation conditions in GexSe1-x ovonic threshold switching selectors. IEEE Electron Device Letters. ISSN 0741-3106

Chai, Z, Freitas, P, Zhang, WD, Hatem, F, Zhang, JF, Marsland, J, Govoreanu, B, Goux, L and Kar, GS (2018) Impact of RTN on Pattern Recognition Accuracy of RRAM-based Synaptic Neural Network. IEEE Electron Device Letters. ISSN 0741-3106

Chai, Z, Zhang, WD, Freitas, P, Hatem, F, Zhang, JF, Marsland, J, Govoreanu, B, Goux, L, Kar, GS, Hall, S, Chalker, P and Robertson, J (2018) The over-reset phenomenon in Ta2O5 RRAM device investigated by the RTN-based defect probing technique. IEEE Electron Device Letters, 39 (7). pp. 955-958. ISSN 0741-3106

Hatem, F, Chai, Z, Zhang, WD, Fantini, A, Degraeve, R, Clima, S, Garbin, D, Robertson, J, Guo, Y, Zhang, JF, Marsland, J, Freitas, P, Goux, L and Kar, G Endurance improvement of more than five orders in GexSe1-x OTS selectors by using a novel refreshing program scheme. In: IEEE International Electron Device Meeting (IEDM), 09 December 2019 - 11 December 2019, San Francisco. (Accepted)

Chai, Z, Zhang, W, Degraeve, R, Clima, S, Hatem, F, Zhang, JF, Freitas, P, Marsland, J, Fantini, A, Garbin, D, Goux, L and Kar, G Evidence of filamentary switching and relaxation mechanisms in GexSe1-x OTS selectors. In: 2019 Symposia on VLSI Technology and Circuits, 10 June 2019 - 14 June 2019, Kyoto, Japan. (Accepted)

Freitas, P, Zhang, WD, Chai, Z, Zhang, JF and Marsland, J Impact of RTN and Variability on RRAM-Based Neural Network. In: IEEE 15th International Conference on Solid-State and Integrated-Circuit Technology, 03 November 2020 - 06 November 2020, Kunming, China. (Accepted)