| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터) |
| 권호 |
44권 2호 |
| 발표분야 |
분자전자 부문위원회 II |
| 제목 |
Synergetic Synchronization of Bulkheterojunction and Planarheterojunction to Realize Optimal Morphology for High Performance Polymer Photodiode |
| 초록 |
Bulk heterojunction (BHJ) organic photodiode (OPD) produces a high dark current due to a charge injection from electrode to active layer, resulting in low specific detectivity (D*). To overcome this issue, planar heterojunction (PHJ) OPD with large charge injection barrier can be used to suppress the charge injection for high D*, however, the performance is still limited by low photocurrent due to limited p-n junction interface. We demonstrate a layered BHJ of OPD via polymer-polymer phase separation. Unprecedentedly high nano-scale roughness between hydrophobic F8T2 and hydrophilic PMMA is observed due to the Marangoni instability. Followed by selective removal of insulating PMMA, n-type semiconductor ITIC is upper-deposited by spin-coating. In a consequence, BHJ-like morphology is created between F8T2 and ITIC while both electrode-active layer interfaces remain as large injection barrier. As a result, we achieved higher D* than both PHJ, BHJ, yielding over 1013 Jones at 670 nm. |
| 저자 |
김정환, 박수연, 이연우, 최현빈, 남건희, 정대성
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| 소속 |
대구경북과학기술원 |
| 키워드 |
polymer photodiode; morphology; phase separation; high detectivity
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| E-Mail |
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