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BTP-eC9 is a structural analogue to the popular BTP-4Cl (Y7) acceptor. BTP-eC9 features enhanced intermolecular ordering compared to BTP-4Cl (Y7) acceptor due to the modification of the alkyl chains(1), and has been used to create devices with power conversion efficiencies of 18% in the academic literature.(2) Similar to BTP-4Cl (Y7), the BTP-eC9 features chlorinated end groups which give the material energetically deep HOMO and LUMO levels.

Useful References:

(1) Lin, Y., Firdaus, Y., Isikgor, F.H., Nugraha, M.I., Yengel, E., Harrison, G.T., Hallani, R., El-Labban, A., Faber, H., Ma, C., Zheng, X., Subbiah, A., Howells, C.T., Bakr, O.M., McCulloch, I., De Wolf, S., Tsetseris, L., and Anthopoulos, T.D. Self-Assembled Monolayer Enables Hole Transport Layer-Free Organic Solar Cells with 18% Efficiency and Improved Operational Stability
ACS Energy Letters 2020, 5 (9), 2935-2944. DOI: 10.1021/acsenergylett.0c01421

(2) Cui, Y., Yao, H., Zhang, J., Xian, K., Zhang, T., Hong, L., Wang, Y., Xu, Y., Ma, K., An, C., He, C., Wei, Z., Gao, F., Hou, J., Singleā€Junction Organic Photovoltaic Cells with Approaching 18% Efficiency. Adv. Mater. 2020, 32, 1908205. DOI: 10.1002/adma.201908205

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