2D black phosphorous nanosheets as a hole transporting material in perovskite solar cells

JOURNAL OF POWER SOURCES

卷:371

Article

Muduli, Subas Kumar¹  Varrla, Eswaraiah^1,5  Kulkarni, Sneha Avinash¹  Han, Guifang¹  Thirumal, Krishnamoorthy¹  Lev, Ovadia^2,3  Mhaisalkar, Subodh^1,4  Mathews, Nripan^1,4 

[1] Energy Res Inst NTU ERI N, Res Techno Plaza,50 Nanyang Dr, Singapore 637553, Singapore

[2] Hebrew Univ Jerusalem, Casali Ctr, Harvey M Krueger Family Ctr Nanosci & Nanotechnol, Edmond J Safra Campus, IL-91904 Jerusalem, Israel

[3] Hebrew Univ Jerusalem, Inst Chem, Harvey M Krueger Family Ctr Nanosci & Nanotechnol, Edmond J Safra Campus, IL-91904 Jerusalem, Israel

[4] Nanyang Technol Univ, Sch Mat Sci & Engn, Nanyang Ave, Singapore 639798, Singapore

[5] SRM Univ, SRM Res Inst, Dept Phys & Nanotechnol, Chennai 603203, Tamil Nadu, India

关键词: Black phosphorus (BP);    HTM;    Perovskite;    Solar cells;    MAPbI(3);   

DOI  :  10.1016/j.jpowsour.2017.10.018

来源: Elsevier

【 摘 要 】

We demonstrate for the first-time liquid exfoliated few layers of 2D Black phosphorus (BP) nanosheets as a hole transporting material (HTM) for perovskite based solar cells. The photoelectron spectroscopy in air (PESA) measurements confirm the low laying valence band level of BP nanosheets (-5.2 eV) favourable for hole injection from CH3NH3PbI3 (MAPbI(3)). Our results show that similar to 25% improvement in power conversion efficiency (PCE) of eta = 16.4% for BP nanosheets + Spiro-OMeTAD as an HTM as compared to spiro-OMeTAD (eta = 13.1%). When BP nanosheets are exclusively utilised as an HTM, a PCE of eta = 7.88% is noted, an improvement over the 4% PCE values observed for HTM free devices. Photoluminescence (PL) quenching of MAPbI3 and impedance measurements further confirm the charge extraction ability of BP nanosheets. The structural and optical characterization of liquid exfoliated BP nanosheets is discussed in detail with the aid of transmission electron microscopy, Raman spectroscopy, absorption spectroscopy and photo-electron spectroscopy.

【 授权许可】

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