Radiation induced recombination centers in organic solar cells

Street, R. A.; Northrup, John E.; Krusor, B. S.

doi:10.1103/physrevb.85.205211

Cited by 78 publications

(116 citation statements)

References 43 publications

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“…is possible by the decoupling of C-H, N-H or C-N bounds via interaction with the photogenerated electrons. [33][34][35] It is shown that the mentioned fragments of CH3NH3, located in the perovskite interstitial, and their possible complexes with iodine atoms form deep energy levels in the band gap and considerably increase non-radiative recombination losses. [36] This statement correlates with our experimentally measured DC electrical and photoelectrical properties and AC characteristics of the control solar cell: large values of the ideality coefficient n1 and the slope of the Voc vs. light intensity dependence ( Figure 2a and 4b); small values of the recombination lifetime τ and the effective recombination order β (Figure 5c and 5d).…”

Section: Discussionmentioning

confidence: 99%

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Брус

Lang

Bundesmann

et al. 2017

Adv Elect Materials

111

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Section: Discussionmentioning

confidence: 99%

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Брус

Lang

Bundesmann

et al. 2017

Adv Elect Materials

111

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“…III) and Shockley-Read-Hall 31,32 recombination between free charges and charges trapped in these tail states. In later sections of this paper, we add recombination via deep states 12,13 (Sec. IV) and surface recombination 33 (Sec.…”

Section: Description Of the Experiments To Be Simulatedmentioning

confidence: 99%

“…Due to the low dielectric constants, and in consequence due to the high exciton binding energies in molecular semiconductors, the situation is less clear in organic solar cells where geminate recombination of excitons or bound charge carriers can be a substantial loss mechanism. 1,2 However, recent studies [3][4][5][6][7][8][9][10][11][12][13] suggest that nongeminate recombination is limiting the efficiency of most well-performing bulk heterojunction solar cells. Experimentally, nongeminate recombination is often studied at the open circuit where, due to the lack of an external current flow, effects of series resistances and charge carrier transport are minimized.…”

Section: Introductionmentioning

confidence: 99%

Meaning of reaction orders in polymer:fullerene solar cells

2012

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Nongeminate recombination in polymer:fullerene solar cells is frequently characterized using transient optoelectronic measurements that allow the determination of recombination rates, charge carrier lifetimes, and average charge carrier concentrations as a function of voltage. These data are often interpreted in terms of an empirical reaction order defining how recombination depends on measured charge density. In polymer:fullerene solar cells, the empirical reaction orders are often considerably larger than 2, which had previously been explained in terms of the nonlinear relationship between mobile and trapped charge carriers in the presence of an exponential tail of localized states. Here, we show that experimentally determined reaction orders depend not only on the shape of the density of states but also on the spatial distribution of carriers. In particular, in solar cells with small depletion regions due to small active layer thicknesses or due to large unintentional background doping of the polymers, the reaction order can assume values that are much larger than the value expected from the shape of the density of states alone.

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“…6 Finally, lightinduced degradation is highly important, since solar cells operate under relatively high photon uxes. Recent research has proposed both general mechanisms for light-induced degradation in all polymers 16,17 and more specic reactions 18,19 in various materials, including crosslinking 20 and fullerene dimerization. 21 A conclusive explanation of the mechanisms behind light-induced degradation, however, is still missing.…”

Section: Introductionmentioning

confidence: 99%