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Self-Assembled Monolayer Enables Hole Transport Layer-Free Organic Solar Cells with 18% Efficiency and Improved Operational Stability
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-18 , DOI: 10.1021/acsenergylett.0c01421 Yuanbao Lin 1 , Yuliar Firdaus 1 , Furkan H. Isikgor 1 , Mohamad Insan Nugraha 1 , Emre Yengel 1 , George T. Harrison 1 , Rawad Hallani 1 , Abdulrahman El-Labban 1 , Hendrik Faber 1 , Chun Ma 1 , Xiaopeng Zheng 2 , Anand Subbiah 1 , Calvyn T. Howells 1 , Osman M. Bakr 2 , Iain McCulloch 1 , Stefaan De Wolf 1 , Leonidas Tsetseris 3 , Thomas D. Anthopoulos 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-18 , DOI: 10.1021/acsenergylett.0c01421 Yuanbao Lin 1 , Yuliar Firdaus 1 , Furkan H. Isikgor 1 , Mohamad Insan Nugraha 1 , Emre Yengel 1 , George T. Harrison 1 , Rawad Hallani 1 , Abdulrahman El-Labban 1 , Hendrik Faber 1 , Chun Ma 1 , Xiaopeng Zheng 2 , Anand Subbiah 1 , Calvyn T. Howells 1 , Osman M. Bakr 2 , Iain McCulloch 1 , Stefaan De Wolf 1 , Leonidas Tsetseris 3 , Thomas D. Anthopoulos 1
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We report on bulk-heterojunction (BHJ) organic photovoltaics (OPVs) based on the self-assembled monolayer (SAM) 2PACz as a hole-selective interlayer functionalized directly onto the indium tin oxide (ITO) anode. The 2PACz is found to change the work function of ITO while simultaneously affecting the morphology of the BHJ deposited atop. Cells with PM6:N3 BHJ and ITO-2PACz anode exhibit a power conversion efficiency (PCE) of 16.6%, which is greater than that measured for bare ITO (6.45%) and ITO/PEDOT:PSS (15.94%) based devices. The enhanced performance is attributed to lower contact-resistance, reduced bimolecular recombination losses, and improved charge transport within the BHJ. Importantly, the ITO-2PACz-based OPVs show dramatically improved operational stability when compared with PEDOT:PSS-based cells. When the ITO-2PACz anode is combined with the ternary PM6:BTP-eC9:PC71BM BHJ, the resulting cells exhibit a maximum PCE of 18.03%, highlighting the potential of engineered SAMs for use in hole-selective contacts in high-performance OPVs.
中文翻译：
自组装单层可实现无空穴传输层的有机太阳能电池，效率达到18％，并提高了操作稳定性
我们报告了基于自组装单分子层（SAM）2PACz的本体异质结（BHJ）有机光伏（OPV），该空穴作为选择性地功能化到铟锡氧化物（ITO）阳极上的空穴选择性中间层。发现2PACz会改变ITO的功函数，同时会影响顶部沉积的BHJ的形态。具有PM6：N3 BHJ和ITO-2PACz阳极的电池的功率转换效率（PCE）为16.6％，高于基于裸ITO（6.45％）和ITO / PEDOT：PSS的器件（15.94％）的功率转换效率。增强的性能归因于较低的接触电阻，减少的双分子重组损失以及改善的BHJ内电荷传输。重要的是，与基于PEDOT：PSS的电池相比，基于ITO-2PACz的OPV显示出显着改善的运行稳定性。71 BM BHJ，所得电池的最大PCE为18.03％，突显了工程SAM用于高性能OPV的孔选择触点的潜力。
更新日期：2020-09-11
中文翻译：
自组装单层可实现无空穴传输层的有机太阳能电池，效率达到18％，并提高了操作稳定性
我们报告了基于自组装单分子层（SAM）2PACz的本体异质结（BHJ）有机光伏（OPV），该空穴作为选择性地功能化到铟锡氧化物（ITO）阳极上的空穴选择性中间层。发现2PACz会改变ITO的功函数，同时会影响顶部沉积的BHJ的形态。具有PM6：N3 BHJ和ITO-2PACz阳极的电池的功率转换效率（PCE）为16.6％，高于基于裸ITO（6.45％）和ITO / PEDOT：PSS的器件（15.94％）的功率转换效率。增强的性能归因于较低的接触电阻，减少的双分子重组损失以及改善的BHJ内电荷传输。重要的是，与基于PEDOT：PSS的电池相比，基于ITO-2PACz的OPV显示出显着改善的运行稳定性。71 BM BHJ，所得电池的最大PCE为18.03％，突显了工程SAM用于高性能OPV的孔选择触点的潜力。
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