[PDF]     https://doi.org/10.3952/physics.2025.65.4.7

Open access article / Atviros prieigos straipsnis
 
 Lith. J. Phys. 65, 248–257 (2025)
 

HOT CARRIER TRANSPORT IN SOLAR CELLS
Steponas Ašmontas, Jonas Gradauskas, Aurimas Čerškus, Algirdas Sužiedėlis, Edmundas Širmulis, and Ovidijus Žalys
State Research Institute Center for Physical Sciences and Technology, Saulėtekio 3, 10257 Vilnius, Lithuania
Email: steponas.asmontas@ftmc.lt

Received 20 November 2025; accepted 20 November 2025

The study presents the findings on photovoltage formation in solar cells subjected to pulsed laser excitation. Transient photovoltage measurements reveal that the photoresponse comprises two components with opposite polarities, expressed as U = Uf + Uph. The fast component, which mirrors the laser pulse profile, arises from the heating of charge carriers by the incident light. In contrast, the slow component corresponds to the conventional photovoltage generated through electron–hole pair creation. The detrimental effect of hot carriers on the power conversion efficiency of perovskite solar cells can be alleviated by reducing band bending near the charge transport layers or by adopting a multijunction cell architecture. This approach enhances spectral utilization and minimizes thermalization losses.
Keywords: hot carriers, solar cell, photovoltage, p-n junction


KARŠTŲJŲ KRŪVININKŲ PERNAŠA SAULĖS ELEMENTUOSE
Steponas Ašmontas, Jonas Gradauskas, Aurimas Čerškus, Algirdas Sužiedėlis, Edmundas Širmulis, Ovidijus Žalys
Fizinių ir technologijos mokslų centras, Vilnius, Lietuva
 
Straipsnyje pateikiami fotoįtampos susidarymo saulės elementuose tyrimų rezultatai, esant impulsiniam lazeriniam sužadinimui. Pereinamosios fotoįtampos matavimai rodo, kad fotoatsakas U saulės elementuose susideda iš dviejų priešingo poliškumo dedamųjų: Uf ir Uph. Spartųjį fotoatsako sandą lemia šviesos kaitinami krūvininkai, jis atkartoja lazerio impulso formą, o lėtasis sandas yra tipinė fotoįtampa, atsirandanti dėl elektronų ir skylių porų generacijos. Karštųjų krūvininkų neigiamą poveikį perovskito saulės elementų energijos konversijai galima sušvelninti mažinant energinių juostų užlinkimą šalia krūvio pernašos sluoksnių arba naudojant daugiasandūrinius saulės elementų darinius, kurie efektyviau išnaudoja saulės spektrą ir sumažina šiluminius energijos nuostolius.


References / Nuorodos

[1] C. Yu, S. Xu, J. Yao, and S. Han, Recent advances in and new perspectives on crystalline silicon solar cells with carrier-selective passivation contacts, Crystals 8(11), 430 (2018),
https://doi.org/10.3390/cryst8110430
[2] P. Węgierek, J. Pastuszak, K. Dziadosz, and M. Turek, Influence of substrate type and dose of implanted ions on the electrical parameters of silicon in terms of improving the efficiency of photovoltaic cells, Energies 13(24), 6708 (2020),
https://doi.org/10.3390/en13246708
[3] W. Shockley and H.J. Queisser, Detailed balance limit of efficiency of p-n junction solar cells, J. Appl. Phys. 32(3), 510–519 (1961),
https://doi.org/10.1063/1.1736034
[4] A. Polman, M. Knight, E.C. Garnett, B. Ehrler, and W.C. Sinke, Photovoltaic materials: Present efficiencies and future challenges, Science 352(6283), aad4424 (2016),
https://doi.org/10.1126/science.aad4424
[5] A. Sachenko, V. Kostylyov, I. Sokolovskyi, and M. Evstigneev, Effect of temperature on limit photoconversion efficiency in silicon solar cells, IEEE J. Photovolt. 10(1), 63–69 (2020),
https://doi.org/10.1109/jphotov.2019.2949418
[6] S. Ašmontas, J. Gradauskas, A. Sužiedėlis, A. Šilėnas, E. Širmulis, V. Švedas, V. Vaičikauskas, and O. Žalys, Hot carrier impact on photovoltage formation in solar cells, Appl. Phys. Lett. 113(7), 071103 (2018),
https://doi.org/10.1063/1.5043155
[7] S. Ašmontas, J. Gradauskas, A. Sužiedėlis, A. Šilėnas, E. Širmulis, V. Vaičikauskas, V. Vaičiūnas, O. Žalys, L. Fedorenko, and L. Bulat, Photovoltage formation across GaAs p–n junction under illumination of intense laser radiation, Opt. Quant. Electron. 48(9), 448 (2016),
https://doi.org/10.1007/s11082-016-0702-z
[8] I. Marmur, Y. Oksman, and A.A. Semenov, Hot carrier current through p-n junction, Phys. Techn. Poluprovodn. 8, 2216–2217 (1974) [in Russian]
[9] A.V. Andrianov, P.M. Valov, V.L. Sikhanov, V.V. Tuchkevich, and N.M. Shmidt, Hot carrier current through p-n junction, Phys. Techn. Poluprovodn. 14, 859–864 (1980) [in Russian]
[10] S. Ašmontas, J. Gradauskas, K. Naudžius, and E. Širmulis, Photoresponse of InSb-based p-n structures during illumination by CO2 laser radiation, Phys. Techn. Poluprovodn. 28, 1089–1091 (1994) [in Russian]
[11] S. Asmontas, J. Gradauskas, D. Seliuta, and E. Sirmulis, Photoelectrical properties of nonuniform semiconductor under infrared laser radiation, in: Nonresonant Laser-Matter Interaction (NLMI-10), Vol. 4423, ed. M.N. Libenson (SPIE 2001) pp. 18–27,
https://doi.org/10.1117/12.431223
[12] R.T. Ross and A.J. Nozik, Efficiency of hot-carrier solar energy converters, J. Appl. Phys. 53(5), 3813–3818 (1982),
https://doi.org/10.1063/1.331124
[13] G.J. Conibeer, D. König, M.A. Green, and J.F. Guillemoles, Slowing of carrier cooling in hot carrier solar cells, Thin Solid Films 516(20), 6948–6953 (2008),
https://doi.org/10.1016/j.tsf.2007.12.102
[14] G. Conibeer, N. Ekins-Daukes, J.-F. Guillemoles, D. König, E.-C. Cho, C.-W. Jiang, S. Shrestha, and M. Green, Progress on hot carrier cells, Sol. Energy Mater. Sol. Cells 93(6–7), 713–719 (2009),
https://doi.org/10.1016/j.solmat.2008.09.034
[15] A. Luque and A. Martí, Electron–phonon energy transfer in hot-carrier solar cells, Sol. Energy Mater. Sol. Cells 94(2), 287–296 (2010),
https://doi.org/10.1016/j.solmat.2009.10.001
[16] G. Conibeer, R. Patterson, L. Huang, J.-F. Guillemoles, D. König, S. Shrestha, and M.A. Green, Modelling of hot carrier solar cell absorbers, Sol. Energy Mater. Sol. Cells 94(9), 1516–1521 (2010),
https://doi.org/10.1016/j.solmat.2010.01.018
[17] A. Le Bris and J.-F. Guillemoles, Hot carrier solar cells: Achievable efficiency accounting for heat losses in the absorber and through contacts, Appl. Phys. Lett. 97(11), 113506 (2010),
https://doi.org/10.1063/1.3489405
[18] D. König, K. Casalenuovo, Y. Takeda, G. Conibeer, J. Guillemoles, R. Patterson, L. Huang, and M. Green, Hot carrier solar cells: Principles, materials and design, Physica E 42(10), 2862–2866 (2010),
https://doi.org/10.1016/j.physe.2009.12.032
[19] D.J. Farrell, Y. Takeda, K. Nishikawa, T. Nagashima, T. Motohiro, and N.J. Ekins-Daukes, A hot-carrier solar cell with optical energy selective contacts, Appl. Phys. Lett. 99(11), 111102 (2011),
https://doi.org/10.1063/1.3636401
[20] Y. Takeda and T. Motohiro, Highly efficient solar cells using hot carriers generated by two-step excitation, Sol. Energy Mater. Sol. Cells 95(9), 2638–2644 (2011),
https://doi.org/10.1016/j.solmat.2011.05.023
[21] A.P. Kirk and M.V. Fischetti, Fundamental limitations of hot-carrier solar cells, Phys. Rev. B 86(16), 165206 (2012),
https://doi.org/10.1103/physrevb.86.165206
[22] J.A.R. Dimmock, S. Day, M. Kauer, K. Smith, and J. Heffernan, Demonstration of a hot-carrier photovoltaic cell, Prog. Photovoltaics Res. Appl. 22(2), 151–160 (2013),
https://doi.org/10.1002/pip.2444
[23] M. Li, S. Bhaumik, T.W. Goh, M.S. Kumar, N. Yantara, M. Grätzel, S. Mhaisalkar, N. Mathews, and T.C. Sum, Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals, Nat. Commun. 8(1), 14350 (2017),
https://doi.org/10.1038/ncomms14350
[24] D.-T. Nguyen, L. Lombez, F. Gibelli, S. Boyer-Richard, A. Le Corre, O. Durand, and J.-F. Guillemoles, Quantitative experimental assessment of hot carrier-enhanced solar cells at room temperature, Nat. Energy 3(3), 236–242 (2018),
https://doi.org/10.1038/s41560-018-0106-3
[25] C.-Y. Tsai, Carrier heating and its effects on the current-voltage relations of conventional and hot-carrier solar cells: A physical model incorporating energy transfer between carriers, photons, and phonons, Sol. Energy 188, 450–463 (2019),
https://doi.org/10.1016/j.solener.2019.06.024
[26] S. Kahmann and M.A. Loi, Hot carrier solar cells and the potential of perovskites for breaking the Shockley–Queisser limit, J. Mater. Chem. C 7(9), 2471–2486 (2019),
https://doi.org/10.1039/c8tc04641g
[27] M. Li, J. Fu, Q. Xu, and T.C. Sum, Slow hot-carrier cooling in halide perovskites: Prospects for hot-carrier solar cells, Adv. Mater. 31(47), 1802486 (2019),
https://doi.org/10.1002/adma.201802486
[28] A.S. Sharma, M. Hanif, S.P. Bremner, M.P. Nielsen, M.J.Y. Tayebjee, F.E. Rougieux, N.J. Ekins-Daukes, and A. Pusch, Heat flow through nonideal contacts in hot-carrier solar cells, Phys. Rev. Appl. 20(3), 0340001 (2023),
https://doi.org/10.1103/PhysRevApplied.20.034001
[29] S. Gogoi, S. Das, R. Gupta, and S.D. Verma, Tuning hot-carrier temperature in CsPbBr3 perovskite nanoplatelets through metal halide passivation, J. Phys. Chem. Lett. 16(15), 3832–3839 (2025),
https://doi.org/10.1021/acs.jpclett.5c00273
[30] S. Ašmontas, Electrogradient phenomena in semiconductors, in: Electrogradient Phenomena in Semiconductors, Vol. 5, Electrons in Semiconductors, ed. prof. J. Požela (Mokslas, Vilnius, 1984) [in Russian]
[31] Y. Yang, D.P. Ostrowski, R.M. France, K. Zhu, J. van de Lagemaat, J.M. Luther, and M.C. Beard, Observation of a hot-phonon bottleneck in lead-iodide perovskites, Nature Photon. 10(1), 53–59 (2015),
https://doi.org/10.1038/nphoton.2015.213
[32] T. Faber, L. Filipovic, and L. Koster, The hot phonon bottleneck effect in metal halide perovskites, J. Phys. Chem. Lett. 15(51), 12601–12607 (2024),
https://doi.org/10.1021/acs.jpclett.4c03133
[33] J. Tan, Y. Zhou, X. Feng, X. Cao, Y. Xi, Y. Wu, D. Lu, T. Han, Y. Huang, and X. Xu, Long-range hot carrier transport in lead-free cesium tin halide perovskite microplates, Appl. Phys. Lett. 125(25), 251102 (2024),
https://doi.org/10.1063/5.0243080
[34] A.J. Nozik, Utilizing hot electrons, Nat. Energy 3(3), 170–171 (2018),
https://doi.org/10.1038/s41560-018-0112-5
[35] S. Ašmontas and A. Sužiedėlis, Electrical properties of small area n-n+ junction, Lith. Phys. J. 33, 45–51 (1993)
[36] A.D. Bristow, N. Rotenberg, and H.M. van Driel, Two-photon absorption and Kerr coefficients of silicon for 850–2200 nm, Appl. Phys. Lett. 90(19), 191104 (2007),
https://doi.org/10.1063/1.2737359
[37] A. Dargys and J. Kundrotas, Handbook on Physical Properties of Ge, Si, GaAs, and InP (Science and Encyclopedia Publishers, Vilnius, 1994)
[38] M. Saliba, T. Matsui, J.-Y. Seo, K. Domanski, J.-P. Correa-Baena, M.K. Nazeeruddin, S.M. Zakeeruddin, W. Tress, A. Abate, A. Hagfeldt, and M. Grätzel, Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency, Energy Environ. Sci. 9(6), 1989–1997 (2016),
https://doi.org/10.1039/C5EE03874J
[39] T. Singh and T. Miyasaka, Stabilizing the efficiency beyond 20% with a mixed cation perovskite solar cell fabricated in ambient air under controlled humidity, Adv. Energy Mater. 8(3), 1700677 (2018),
https://doi.org/10.1002/aenm.201700677
[40] S. Ašmontas, A. Čerškus, J. Gradauskas, A. Grigucevičienė, K. Leinartas, A. Lučun, K. Petrauskas, A. Selskis, A. Sužiedėlis, E. Širmulis, and R. Juškėnas, Cesium-containing triple cation perovskite solar cells, Coatings 11(3), 279 (2021),
https://doi.org/10.3390/coatings11030279
[41] X. Sun, J. Xu, L. Xiao, J. Chen, B. Zhang, J. Yao, and S. Dai, Influence of the porosity of the TiO2 film on the performance of the perovskite solar cell, Int. J. Photoenergy 2017(1), 4935265 (2017),
https://doi.org/10.1155/2017/4935265
[42] J. Wang, X. Zou, J. Zhu, J. Cheng, D. Chen, X. Bai, Y. Yao, C. Chang, X. Yu, B. Liu, Z. Zhou, and G. Li, Effect of optimization of TiO2 electron transport layer on performance of perovskite solar cells with rough FTO substrates, Materials 13(10), 2272 (2020),
https://doi.org/10.3390/ma13102272
[43] S. Ašmontas and A. Olekas, Thermoelectromotive force and diffusion of hot electrons in metal semiconductor Schottky barrier, Phys. Techn. Poluprovodn. 14, 2196 (1980) [in Russian]
[44] M. Mujahid, A. Čerškus, J. Gradauskas, A. Grigucevičienė, R. Giraitis, K. Leinartas, A. Lučun, K. Petrauskas, A. Selskis, A. Sužiedėlis, A. Šilėnas, E. Širmulis, and S. Ašmontas, Unveiling the influence of hot carriers on photovoltage formation in perovskite solar cells, Materials (Basel) 18(1), 85 (2025),
https://doi.org/10.3390/ma18010085
[45] R. Hidayat, A.A. Nurunnizar, A. Fariz, Herman, E.S. Rosa, Shobih, T. Oizumi, A. Fujii, and M. Ozaki, Revealing the charge carrier kinetics in perovskite solar cells affected by mesoscopic structures and defect states from simple transient photovoltage measurements, Sci. Rep. 10(1), 19197 (2020),
https://doi.org/10.1038/s41598-020-74603-x
[46] P. Ščajev, C. Qin, R. Aleksiejūnas, P. Baronas, S. Miasojedovas, T. Fujihara, T. Matsushima, C. Adachi, and S. Juršėnas, Diffusion enhancement in highly excited MAPbI3 perovskite layers with additives, J. Phys. Chem. Lett. 9(12), 3167–3172 (2018),
https://doi.org/10.1021/acs.jpclett.8b01155
[47] M. Mujahid, J. Gradauskas, A. Sužiedėlis, E. Širmulis, and S. Ašmontas, Recent advancements in understanding hot carrier dynamics in perovskite solar cells, Energies 18(13), 3543 (2025),
https://doi.org/10.3390/en18133543