A laminar MAPbBr3/MAPbBr3−xIx graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance†,Journal of Materials Chemistry C

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A laminar MAPbBr3/MAPbBr3−xIx graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-04-16 00:00:00 , DOI: 10.1039/c9tc00972h
Wen-Guang Li _{1,

2,

3,

4,

5} , Xu-Dong Wang _{1,

2,

3,

4,

5} , Jin-Feng Liao _{1,

2,

3,

4,

5} , Ze-Feng Wei _{1,

2,

3,

4,

5} , Yang-Fan Xu _{1,

2,

3,

4,

5} , Hong-Yan Chen _{1,

2,

3,

4,

5} , Dai-Bin Kuang _{1,

2,

3,

4,

5}

Affiliation

Halide perovskite single crystals (SCs) have recently been regarded as a promising candidate in optoelectronic devices by virtue of their remarkable intrinsic properties. Herein, a laminar MAPbBr₃/MAPbBr_3−xI_x (MA = CH₃NH₃⁺) graded heterojunction single crystal (GHSC) with a thickness of about 11 μm and an area of 4 × 5 mm has been synthesized via a space-limited inverse temperature crystallization growth method and a gaseous halide exchange process in sequence. Compared to the pristine MAPbBr₃ SC, such a MAPbBr₃/MAPbBr_3−xI_x GHSC possesses graded valence band alignment via a halide gradient distribution, which significantly enhances the hole extraction and accelerates carrier transport, leading to a high-performance perovskite SC photodetector with an improved external quantum efficiency of ≈170% at −2 V and an impressively rapid response speed of 0.56 μs. Our results provide a promising strategy to solve the carrier extraction obstacle and suppress recombination loss, which opens potential optoelectronic applications of laminar heterojunction SCs.

中文翻译：

层状MAPbBr ₃ / MAPbBr _{3− x} I _x梯度异质结单晶，用于增强电荷提取和光电性能†

卤化物钙钛矿单晶（SCs）由于其非凡的内在特性，最近被认为是光电子器件中有希望的候选者。在此，在层MAPbBr ₃ / MAPbBr _{3- X}我_X（MA = CH ₃ NH ₃⁺）分级异质单晶（GHSC）的厚度为约11微米，4×5毫米的区域已被合成通过的空间有限逆温度结晶生长方法和卤化物气态交换过程。与原始的MAPbBr ₃ SC相比，这样的MAPbBr ₃ / MAPbBr _{3− x} I _xGHSC通过卤化物梯度分布具有分级的价带对准，这显着增强了空穴提取并加速了载流子传输，从而导致了一种高性能钙钛矿SC光电探测器，其在-2 V时的外部量子效率提高了约170％，并且具有惊人的快速性响应速度为0.56μs。我们的结果为解决载流子提取障碍和抑制重组损失提供了一种有前途的策略，这为层状异质结SC的潜在光电应用打开了大门。

更新日期：2019-04-16

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