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| 001 | 878470 | ||
| 005 | 20240712084533.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevApplied.14.024034 |2 doi |
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| 100 | 1 | _ | |a Xiao, Biao |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Relationship between Fill Factor and Light Intensity in Solar Cells Based on Organic Disordered Semiconductors: The Role of Tail States |
| 260 | _ | _ | |a College Park, Md. [u.a.] |c 2020 |b American Physical Society |
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| 520 | _ | _ | |a The origin of the relationship between fill factor (FF) and light intensity (I) in organic disordered-semiconductor-based solar cells is studied. An analytical model describing the balance between transport and recombination of charge carriers, parameterized with a factor, Γm, is introduced to understand the FF-I relation, where higher values of Γm correlate to larger FFs. Comparing the effects of direct and tail-state-mediated recombination on the FF-I plot, we find that, for low-mobility systems, direct recombination with constant transport mobility can deliver only a negative dependence of Γm,dir on light intensity. By contrast, tail-state-mediated recombination with trapping and detrapping processes can produce a positive Γm,t versus sun dependency. The analytical model is validated by numerical drift-diffusion simulations. To further validate our model, two material systems that show opposite FF-I behavior are studied: poly{4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]benzo[1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-[4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2-6-diyl]} (PTB7-Th):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) devices show a negative FF-I relation, while PTB7-Th:(5Z,5′Z)-5,5′-{[7,7′ -(4,4,9,9-tetraoctyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(benzo[c][1,2,5]thiadiazole-7,4-diyl)]bis(methanylylidene)}bis(3-ethyl-2-thioxothiazolidin-4-one) (O-IDTBR) devices show a positive correlation. Optoelectronic measurements show that the O-IDTBR device presents a higher ideality factor, stronger trapping and detrapping behavior, and a higher density of trap states, relative to the PC71BM device, supporting the theoretical model. This work provides a comprehensive understanding of the correlation between FF and light intensity for disordered-semiconductor-based solar cells. |
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| 700 | 1 | _ | |a Yan, Jun |0 0000-0001-9966-4357 |b 4 |e Corresponding author |
| 700 | 1 | _ | |a Nelson, Jenny |0 P:(DE-HGF)0 |b 5 |
| 773 | _ | _ | |a 10.1103/PhysRevApplied.14.024034 |g Vol. 14, no. 2, p. 024034 |0 PERI:(DE-600)2760310-6 |n 2 |p 024034 |t Physical review applied |v 14 |y 2020 |x 2331-7019 |
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