Abstract
Elemental selenium (Se), as the world’s first but long-neglected photovoltaic material, has regained great interest recently in tandem solar cells as top cells due to its wide bandgap (∼1.8 eV), simple, non-toxic and earth-abundant composition, and intrinsic environmental stability. In particular, Se possesses the lowest melting point of 217 °C among the photovoltaic absorbers reported so far, endowing Se with a unique advantage of film fabrication by blade coating the Se melt on substrate. However, the poor wettability of Se melt on widely-used photovoltaic functional layers such as TiO2 limits its melt processing. Here we introduce a wettability-modification strategy that decreases the contact angle of Se melt on substrate and improves the wettability by appropriately enhancing the heating temperature of molten Se while avoiding Se volatilization. We further reveal the mechanism of the inherent air stability of Se that originates from the high activation energy of oxygen chemisorption on Se (3.21 eV). This enables the realization of compact Se films through melt-based blade coating in ambient air. The resulting Se solar cells exhibit an efficiency of 3.5%. Unencapsulated devices show no efficiency loss after 1,000 h of storage under ambient conditions.
Similar content being viewed by others
References
Smith W. Nature, 1873, 7: 303–303
Adams WG, Day RE. Proc R Soc London, 1877, 25: 113–117
Fritts CE. Am J Sci, 1883, 26: 465–472
Chapin DM, Fuller CS, Pearson GL. J Appl Phys, 1954, 25: 676–677
Nakada T, Kunioka A. Jpn J Appl Phys, 1985, 24: L536–L538
Todorov TK, Singh S, Bishop DM, Gunawan O, Lee YS, Gershon TS, Brew KW, Antunez PD, Haight R. Nat Commun, 2017, 8: 682
Hadar I, Song T, Ke W, Kanatzidis MG. Adv Energy Mater, 2019, 9: 1802766
Lin R, Xu J, Wei M, Wang Y, Qin Z, Liu Z, Wu J, Xiao K, Chen B, Park SM, Chen G, Atapattu HR, Graham KR, Xu J, Zhu J, Li L, Zhang C, Sargent EH, Tan H. Nature, 2022, 603: 73–78
Li K, Tang J. Sci China Chem, 2021, 64: 1605–1606
Chen W, Zhu Y, Xiu J, Chen G, Liang H, Liu S, Xue H, Birgersson E, Ho JW, Qin X, Lin J, Ma R, Liu T, He Y, Ng AMC, Guo X, He Z, Yan H, Djurišić AB, Hou Y. Nat Energy, 2022, 7: 229–237
Feng M, Liu SC, Hu L, Wu J, Liu X, Xue DJ, Hu JS, Wan LJ. J Am Chem Soc, 2021, 143: 9664–9671
Leijtens T, Bush KA, Prasanna R, McGehee MD. Nat Energy, 2018, 3: 828–838
Han Q, Hsieh YT, Meng L, Wu JL, Sun P, Yao EP, Chang SY, Bae SH, Kato T, Bermudez V, Yang Y. Science, 2018, 361: 904–908
Meng L, Zhang Y, Wan X, Li C, Zhang X, Wang Y, Ke X, Xiao Z, Ding L, Xia R, Yip HL, Cao Y, Chen Y. Science, 2018, 361: 1094–1098
Liu SC, Li Z, Yang Y, Wang X, Chen YX, Xue DJ, Hu JS. J Am Chem Soc, 2019, 141: 18075–18082
Wu J, Liu SC, Li Z, Wang S, Xue DJ, Lin Y, Hu JS. Natl Sci Rev, 2021, 8: nwab047
Zhu M, Niu G, Tang J. J Mater Chem C, 2019, 7: 2199–2206
Zhu M, Hao F, Ma L, Song TB, Miller CE, Wasielewski MR, Li X, Kanatzidis MG. ACS Energy Lett, 2016, 1: 469–473
Youngman TH, Nielsen R, Crovetto A, Seger B, Hansen O, Chorkendorff I, Vesborg PCK. Sol RRL, 2021, 5: 2100111
Hadar I, Hu X, Luo ZZ, Dravid VP, Kanatzidis MG. ACS Energy Lett, 2019, 4: 2137–2143
Liu W, Yu F, Fan W, Li WS, Zhang Q. Small, 2021, 17: 2101226
Wu J, Zhang Z, Tong C, Li D, Mei A, Rong Y, Zhou Y, Han H, Hu Y. ACS Appl Mater Interfaces, 2019, 11: 33879–33885
Mitzi DB, Dimitrakopoulos CD, Rosner J, Medeiros DR, Xu Z, Noyan C. Adv Mater, 2002, 14: 1772–1776
Juozapavicius M, O’Regan BC, Anderson AY, Grazulevicius JV, Mimaite V. Org Electron, 2012, 13: 23–30
Li T, Dunlap-Shohl WA, Han Q, Mitzi DB. Chem Mater, 2017, 29: 6200–6204
Liu W, Said AA, Fan WJ, Zhang Q. ACS Appl Energy Mater, 2020, 3: 7345–7352
Degtyareva O, Hernández ER, Serrano J, Somayazulu M, Mao H, Gregoryanz E, Hemley RJ. J Chem Phys, 2007, 126: 084503
Speight JG. Lange’s Handbook of Chemistry. New York: McGraw Hill Book Co., 2005. 1.199–1.225
Vafaei S, Podowski MZ. Adv Colloid Interface Sci, 2005, 113: 133–146
Lee LH. J Non-Cryst Solids, 1971, 6: 213–220
Xiao Y, Zuo C, Zhong J, Wu W, Shen L, Ding L. Adv Energy Mater, 2021, 11: 2100378
Li J, Munir R, Fan Y, Niu T, Liu Y, Zhong Y, Yang Z, Tian Y, Liu B, Sun J, Smilgies DM, Thoroddsen S, Amassian A, Zhao K, Liu SF. Joule, 2018, 2: 1313–1330
Wu WQ, Yang Z, Rudd PN, Shao Y, Dai X, Wei H, Zhao J, Fang Y, Wang Q, Liu Y, Deng Y, Xiao X, Feng Y, Huang J. Sci Adv, 2019, 5: eaav8925
Qin J, Qiu G, Jian J, Zhou H, Yang L, Charnas A, Zemlyanov DY, Xu CY, Xu X, Wu W, Wang H, Ye PD. ACS Nano, 2017, 11: 10222–10229
Huang Y, Qiao J, He K, Bliznakov S, Sutter E, Chen X, Luo D, Meng F, Su D, Decker J, Ji W, Ruoff RS, Sutter P. Chem Mater, 2016, 28: 8330–8339
Kc S, Longo RC, Wallace RM, Cho K. J Appl Phys, 2015, 117: 135301
Liu SC, Dai CM, Min Y, Hou Y, Proppe AH, Zhou Y, Chen C, Chen S, Tang J, Xue DJ, Sargent EH, Hu JS. Nat Commun, 2021, 12: 670
Acknowledgements
This work was supported by the National Science Foundation of China (21922512, 21875264), Chinese Postdoctoral Science Foundation (2021MD703865), and the Youth Innovation Promotion CAS (Y2021014).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest The authors declare no conflict of interest.
Additional information
Supporting information The supporting information is available online at https://chem.scichina.com and https://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
Supporting Information
Rights and permissions
About this article
Cite this article
Lu, W., Li, Z., Feng, M. et al. Melt- and air-processed selenium thin-film solar cells. Sci. China Chem. 65, 2197–2204 (2022). https://doi.org/10.1007/s11426-022-1332-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11426-022-1332-3