Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency

Liang, Ru -Ze; Zhang, Yiming; Savikhin, Victoria; Babics, Maxime; Kan, Zhipeng; Wohlfahrt, Markus; Wehbe, Nimer; Liu, Shengjian; Duan, Tainan; Toney, Michael F.; Laquai, Frédéric; Beaujuge, Pierre M.

doi:10.1002/aenm.201802836

Higher Mobility and Carrier Lifetimes in Solution-Processable Small-Molecule Ternary Solar Cells with 11% Efficiency

Journal Article · Thu Dec 20 00:00:00 EST 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201802836· OSTI ID:1506958

^[1]; Zhang, Yiming ^[1]; Savikhin, Victoria ^[2]; Babics, Maxime ^[1]; Kan, Zhipeng ^[1]; Wohlfahrt, Markus ^[1]; Wehbe, Nimer ^[1]; Liu, Shengjian ^[1]; Duan, Tainan ^[1]; Toney, Michael F. ^[3]; Laquai, Frédéric ^[1]; Beaujuge, Pierre M. ^[1]

King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

Solution–processed small molecule (SM) solar cells have the prospect to outperform their polymer–fullerene counterparts. Considering that both SM donors/acceptors absorb in visible spectral range, higher expected photocurrents should in principle translate into higher power conversion efficiencies (PCEs). However, limited bulk–heterojunction (BHJ) charge carrier mobility (<10^–4 cm² V^–1 s^–1) and carrier lifetimes (<1 µs) often impose active layer thickness constraints on BHJ devices (≈100 nm), limiting external quantum efficiencies (EQEs) and photocurrent, and making large–scale processing techniques particularly challenging. In this report, it is shown that ternary BHJs composed of the SM donor DR3TBDTT (DR3), the SM acceptor ICC6 and the fullerene acceptor PC71BM can be used to achieve SM–based ternary BHJ solar cells with active layer thicknesses >200 nm and PCEs nearing 11%. The examinations show that these remarkable figures are the result of i) significantly improved electron mobility (8.2 × 10^–4 cm² V^–1 s^–1), ii) longer carrier lifetimes (2.4 µs), and iii) reduced geminate recombination within BHJ active layers to which PC₇₁BM has been added as ternary component. As a result, optically thick (up to ≈500 nm) devices are shown to maintain PCEs >8%, and optimized DR3:ICC6:PC₇₁BM solar cells demonstrate long–term shelf stability (dark) for >1000 h, in 55% humidity air environment.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1506958

Alternate ID(s):: OSTI ID: 1488622

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 7 Vol. 9; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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